PD7 Light by Thomas E Clark https://padlet.com/tec430/ibk75hfm6iv1 (1) What are electromagnetic waves? (2) List the wave speed equation and the variables? (3) What is the speed of sound and the speed of light? (4) What is luminous flux and the units? (5) What is reflection and what is the difference between diffuse and specular reflection? (5) Display a diagram showing the angle of incidence and angle of reflection. (6) What is the difference between a virtual image and a real image? (7) What the difference between a concave and convex lens ( show shape) (7) What is a the mirror equation ( identify variables) (8) What is the equation for Magnification ( id variables) (9) What are the primary colors? (10) Explain how polarization of light occurs in sun glasses ( how does it block the light out)? en-us 2018-03-20 21:13:21 UTC 2023-02-27 12:55:51 UTC hello@padlet.com Sven, Adrienne, and Sriharish https://padlet.com/tec430/ibk75hfm6iv1/wish/244768517
  •  Electromagnetic waves make up the spectrum of light. The spectrum of light is made up of various waves at different frequencies. We are able to see the middle of the spectrum which is called visible light.
  •  The wave speed (w) is measured in meters per second. It is set equal to the frequency (f) measured in hertz multiplied to the wavelength (l) which is measured in meters. The function can be summarized as w = f * l
  •  The speed of sound is 343 m/s, also known as Mach 1 when referring to the speed of travel. The speed of light is 299,792,458 m/s, it is widely accepted that this is the fastest possible achievable speed.
  •  Luminous flux refers refers to the power/magnitude of a light source. It is measured in lumens.
  • Reflection is the return of light or sound waves from a surface. Diffuse is uniform reflection of light with no directional dependence for the viewer. Specular reflection is a type of surface reflectance often described as a mirror-like reflection of light from the surface.  https://goo.gl/images/d3xAhB
  •   A virtual image is formed at the position where the paths of the principal rays cross when projected backward from their paths beyond the lens. A real image is the image formed where the light rays are focussed.
  • Concave is when the surface curves inwards and a convex surface curves outwards. https://goo.gl/images/SxGDSq
  • The mirror equation is (1/do)+(1/di) = (1/f) (do → the distance from the mirror to the object ; di → the distance from the mirror to the image ; f → the focal length)
  • The equation for magnification is m = (hi/ho) = (di/do) (do → the distance from the mirror to the object ; di → the distance from the mirror to the image ; m → magnification ; hi → the height of the image ;  ho → the height of the object)
  • The primary colors of light are red, green and blue. They combine to make other primary colors. Together all the primary colors combine to make light. The primary colors in paint is red, yellow, and blue. Together all these primary colors combine to create black.
  • It occurs when some of the light is reflected off of the sunglasses. Therefore the black color of the sunglasses reflects white light because some of the white light that is absorbed by the dark shades of the sunglasses is then reflected. This creates the white polarization. It specifically is caused by the diffraction of light, which orients light waves in a certain way so that it can be reflected.

    • ]]>     2018-03-21 21:28:06 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/244768517     Daniel R and Joanna Part 1 https://padlet.com/tec430/ibk75hfm6iv1/wish/244770237
  • Electromagnetic waves are waves that are produced from the acceleration of an electric charge and the periodic variation of intensities of electric and magnetic fields.
  • The wave speed equation is Speed=Wavelength/Period or Speed=Wavelength*Frequency
  • The speed of sound is 343 meters per second and the speed of light is 299,792,458 meters per second.
  • The unit for luminous flux is lumen (lm). Luminous flux is the amount of energy that is emitted from light per second in every direction.

    • ]]>     2018-03-21 21:34:49 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/244770237     Taelynn and Sai https://padlet.com/tec430/ibk75hfm6iv1/wish/244773768 1. Electromagnetic waves are the waves of the electromagnetic spectrum propagating through space-time .
    2. The wave equation is v = f*λ where v is speed in m/s, f is wavelength in m, and λ is frequency in Hz.
    3. Speed of sound: 343 m/s
        Speed of light: 299,792, 458 m/s
    4. luminous flux is the perceived power of light. The units are lumen (lm)
    6.  A virtual image is when the outgoing rays from a point always diverge. A real image is when the outgoing rays converge. Flat mirrors produce virtual images.
    7.Concave is when the surface curves inwards and a convex surface curves outwards.
    8.m = - hi/ho
    m = magnification
    hi = size of image
    ho = size of object
    9. The primary colors are blue, green, and red. 
    10.  Polarized sunglasses protect against the harsh light waves.
    5.

    ]]>     2018-03-21 21:49:49 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/244773768     Kenneth, Indira, Rodas tlakshminarayanan https://padlet.com/tec430/ibk75hfm6iv1/wish/244773915 r  
     can travel through space where matter is not present Electromagnetic waves are produced when an electric charge that moves back and forth 
    ]]>     2018-03-21 21:50:38 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/244773915     Carlos and Jonathan https://padlet.com/tec430/ibk75hfm6iv1/wish/244773939 1. Electromagnetic waves are waves that are produced  from acceleration of an electric charge and the periodic variation of intensities of electric and fields that are magnetic.
    2.  W= F*1
    Speed= wavelength/period
    speed= wavelength * frequency
    3.The speed of sound is 343 meters per second and the speed of light is 299,792,456 meters per second.
    4. Unit for luminous flux is lumen (lm). Luminous flux is the amount of energy that is emitted from light per second in every direction.
    5. Reflection: Return of light or a soun waves via a surface.  Difference between diffuse and specular reflection is that defuse is uniform reflection of light w/ no directional dependence for the viewer meanwhile specular reflection  is a type of surface reflectance often described as a mirror-like reflection of light from the surface 
    6.]]>     2018-03-21 21:50:48 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/244773939     Tushar + David = Good at Physics tlakshminarayanan https://padlet.com/tec430/ibk75hfm6iv1/wish/244773952  1. Electromagnetic waves are the waves that make up the light spectrum. The different waves and frequencies make up the different kinds of light in the spectrum.
    2. The wave speed is measured in meters per second. It is set equal to the frequency measured in hertz multiplied to the wavelength. The function can be summarized as w = f * l
    3. The speed of sound is 343 m/s, and the speed of light is  299,792,458 m/s.
    4. The unit for luminous flux is lumen. This is the amount of energy that is emitted from light per second in every direction.
    5. Reflection is when light or heat bounces off a surface instead of absorbing it. Diffuse reflection is when the reflected property is reflected at multiple angles, while specular reflection is when it is reflected at just one angle.
    5 (2). 
     
    6. A virtual image is an image formed by two diverging lenses, while a real image is simply an image created by the light from one lens.
    7. Convex lenses are shaped outward while concave goes inward.
    7 (2). 
    f = focal length, do = object distance, di = image distance
    8. The magnification equation relates the ratio of the image distance and object distance to the ratio of the image height (hi) and object height (ho). 
    9. Polarization of light occurs in sunglasses since the lenses are flat transparent material, the chemicals from the lenses make it so any light from any horizontal alignment gets absorbed, so only glare from vertical alignments are visible. The glare shifts are you turn your head and the angle of entrance of light changes.
    10. Polarized sunglasses reflect more of the electromagnetic waves which allows for more light to be blocked out
    ]]>     2018-03-21 21:50:51 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/244773952     Scott, Thomas, and Sam https://padlet.com/tec430/ibk75hfm6iv1/wish/244774037 1. Electromagnetic waves are waves of the electromagnetic field that moves through space-time carrying electromagnetic radiant energy.

    2. The wave speed (w) is measured in meters per second which equals the frequency (f, in hertz) multiplied by the wavelength (l, in meters). The formula is w = f * l

    3. The speed of sound is 343 m/s and the speed of light is 299,792,458 m/s.

    4. Luminous flux is the measure of the power of light. It is measured is lumens (lm).

    5. Reflection is a change in direction of a wavefront so it returns to a medium from which it originated. Diffuse reflection splits when t reflects, while specular is reflected off a smooth surface as a definite angle, so it does not split.

    5. 
     
    6. A real image occurs where rays converge. In a virtual image, rays only appear to be converging, formed by diverging lenses or by placing an object inside the focal length of a converging lens.

    7. A convex lens is thicker in the middle. When rays of light pass through, they convege. Concave lenses are thinnger, and rays of light diverge as they pass through.

    7. The mirror equation is (1/f) = (1/d0) + (1/di). f is the focal length. d0 is the object distance, and di is the image distance.

    ]]>     2018-03-21 21:51:18 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/244774037     DV tec430 https://padlet.com/tec430/ibk75hfm6iv1/wish/244774048 Pay your electric bill or join the dark side...... (breathing heavy)]]> 2018-03-21 21:51:20 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/244774048 Derek, Ruchika, and Amrita https://padlet.com/tec430/ibk75hfm6iv1/wish/244830810 (1) What are electromagnetic waves? 
    Electromagnetic waves are created by the vibrations between an electric field and a magnetic field. They are made of oscillating magnetic and electric fields. 
    (2) List the wave speed equation and the variables? 
    The wave speed equation is as follows:
     
    (3) What is the speed of sound and the speed of light? 
    The speed of sound, at STP, is 343 m/s. The speed of light at STP is 299792458 m/s.
    (4) What is luminous flux and the units? 
    Luminous flux is the measure of perceived power of light. The SI units of luminous flux is the lumen, or lm.
    (5) What is reflection and what is the difference between diffuse and specular reflection? 
    Reflection refers to light bouncing off a surface. Diffuse reflection is produced by a rough surface and scatters the light reflections. Specular reflections is from a smooth surface at a definite angle. 
    (6) Display a diagram showing the angle of incidence and angle of reflection.
    (7) What is the difference between a virtual image and a real image? 
    A virtual image is formed by diverging lenses and a real image has to be where the light is (in front of a mirror).
    (8) What the difference between a concave and convex lens (show shape) 
    Convex lens are obtuse (they bulge out). Concave lens curve inwards instead of outwards.
    (9) What is a the mirror equation (identify variables).
    The mirror equation expresses the quantitative relationship between the object distance (do), the image distance (di), and the focal length (f). The equation is stated as follows:

    (10) What is the equation for Magnification (id variables)?
    The magnification equation relates the ratio of the image distance and object distance to the ratio of the image height (hi) and object height (ho). The magnification equation is stated as follows:

    (11) What are the primary colors? 
    The primary colors red, green, and blue.
    (12) Explain how polarization of light occurs in sun glasses (how does it block the light out)?
    Light is an electromagnetic wave and polarized sunglasses reflect some of these electromagnetic waves to minimize how much light reaches your eyes. These glasses block the glare and reduce eye strain so we can see more clearly in situations with lots of sunlight (i.e. driving with the sun rising in front of you).
    ]]>     2018-03-22 03:45:35 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/244830810     Neha Bansal https://padlet.com/tec430/ibk75hfm6iv1/wish/245293656 1. Electromagnetic radiation refers to the waves of the electromagnetic spectrum propagating through space time.
    2. speed= wavelength/period
    speed: wavelength*frequency
    3. The speed of sound, at STP, is 343 m/s. The speed of light at STP is 299792458 m/s.
    4. Luminous flux is the measure of the power of light. It is measured is lumens (lm).
    5. Reflection is light bouncing off an object. image below
    6.  A real image is formed when an object is farther from the converging lens than the focal length. a virtual image is when the object is closer to the lens than the focal length, so the rays diverge to the other side of the lens.
    7. 1/f=1/X+1/Y
    f=focal length
    X=object distance
    Y=image distance
    8.  m=hi/ho=-di/do
    m=magnification
    ho=height of object
    hi=height of image.
    9. The primary colors are blue, green, and red. 
    10. Polarized sunglasses reduce glare becausd the light is blocked and reflected as it travels through the lens into different directions rather than directly into the wearer's eyes. ]]>     2018-03-23 01:17:03 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/245293656     Kenneth, Rodas, Indira https://padlet.com/tec430/ibk75hfm6iv1/wish/245665514 1. Electromagnetic waves are the waves of the electromagnetic spectrum propagating through space time.
    2. The speed= wavelength/period
    speed: wavelength*frequency
    3. The speed of sound is 343 m/s at STP. The speed of light at STP is 299792458 m/s.
    4. Luminous flux is measured in the  power of light. It is measured is lumens (lm).
    5. Reflection is light bouncing off an object. 
    6.  An image ithat is real is formed when an object is farther from the converging lens than the focal length. A virtual image is when the object is closer to the lens than the focal length, so the rays diverge to the other side of the lens.
    7.
    f=focal length
    X=object distance
    Y=image distance
    1/f=1/X+1/Y
    8.  m=hi/ho=-di/do
    m=magnification
    ho=height of object
    hi=height of image.
    9. The primary colors are blue, red, and green. 
    10. The polarized sunglasses reduce glare because the light blocks and reflects as it travels through the lens into the different directions rather than directly into the wearer's eyes. 




    ]]>     2018-03-23 20:58:57 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/245665514     Carlos and Jonathan (Continued) https://padlet.com/tec430/ibk75hfm6iv1/wish/245668812   6.An image ithat is real is formed when an object is farther from the converging lens than the focal length. A virtual image is when the object is closer to the lens than the focal length, so the rays diverge to the other side of the lens.
    7.  1/f=1/X+1/Y
    f=focal length
    X=object distance
    Y=image distance
    8.
    1. The mirror equation is (1/do)+(1/di) = (1/f) (do → the distance from the mirror to the object ; di → the distance from the mirror to the image ; f → the focal length)
    9. primary colors are blue, red, and green.
    10. These glasses help you fight the sun rays from your eyes

    ]]>     2018-03-23 21:20:31 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/245668812     Scott, Thomas, and Sam continueddddd https://padlet.com/tec430/ibk75hfm6iv1/wish/246289745 8. The magnification equation is magnification = image height / object height. M = hi/ho

    9. The primary colors of light are red, green and blue. The primary colors of pigment are cyan, magenta, and yellow.

    10. Polarized sunglasses absorb horizontal light waves while allowing vertical light waves to pass through, reducing glares.]]>     2018-03-26 20:56:28 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/246289745     Josh Bronner https://padlet.com/tec430/ibk75hfm6iv1/wish/246292735 1. Electromagnetic waves are waves that are created as a result of vibrations between an electric field and a magnetic field.
    2. At the bottom
    3. The speed of sound is 343 m/s while the speed of light is 299, 792, 458 m/s
    4. Luminous flux is energy per unit time (dQ/dt) that is radiated from a source over visible wavelengths. The units are  Φv  and  dQ/dt.
    5.  Reflection is the throwing back by a body or surface of light, heat, or sound without absorbing it.
    5. Diffuse is produced by smooth surface while specular reflection is produced by a rough surface.
    6. Real reflection is when rays meet at a point while appear reflection actually meets at a point.
    7. Concave is a converging lense while convex is thinner at the middle.  () convex concabe )(
    7.   The mirror equation expresses the quantitative relationship between the object distance (do), the image distance (di), and the focal length (f). 
    8. The equation for magnification is to take the power of the objective (4X, 10X, 40x) and multiply by the power of the eyepiece, usually 10X.
    9. The primary colors are green, blue, and red. 
    10. ]]>     2018-03-26 21:09:33 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/246292735     https://padlet.com/tec430/ibk75hfm6iv1/wish/246302844 2018-03-26 22:09:01 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/246302844 Abel, Henry, and Hepsi https://padlet.com/tec430/ibk75hfm6iv1/wish/246967579 1. Electromagnetic waves are waves created by vibrations of an electric field.
    2.  speed= wavelength/period
    speed: wavelength*frequency
    3. speed of sound: 343 m.s
    speed of light: 299,792458 m/s
    4.  Luminous flux is the perceived power of light. The units are lumen (lm).
    5. Reflection is the throwing back by a body or surface of light, heat, or sound without absorbing it. Specular reflection is light reflected from a smooth surface at a definite angle. Diffuse reflection, is produced by rough surfaces that tend to reflect light in all directions.
    6.
    7.  Concave lens go inwards convex lens go outwards.
    8. and  9. 
    10. The primary colors red,  green, and blue.
    11. Polarized sunglasses reduce glare because the light is blocked and reflected as it travels through the lens into different directions rather than directly into the wearer's eyes. ]]>     2018-03-28 16:05:58 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/246967579     Daniel Shin https://padlet.com/tec430/ibk75hfm6iv1/wish/247620030 1.Electromagnetic waves are waves created by interacting vibrations between a magnetic and electric field. Encompasses most waves propagated through space time.
    2. speed = wavelength/period.
    speed = wavelength * frequency.
    3.Speed of sound: 343 m/s
    Speed of light: 299,792,458 m/s.
    4.Luminous flux measures the perceived power of light on a surface. Lumens are the most common units.
    5.Reflection is the bouncing of waves off of a surface. In diffuse reflection, light is scattered in many different directions while in specular reflection, light bounces off at only one angle.
    6.Real images are created when light rays actually converge at a point while virtual images are the results of light rays seeming to converge at the point.
    7.A concave lens bends inwards while convex lenses protrude outwards.
    8. Mirror equation:
    1/f=1/X+1/Y
    f=focal length
    X=object distance
    Y=image distance
    9.
    10. Primary Colors: Green, Blue, Red
    11.Polarized glasses filter out and reflect horizontal glare of light.]]>     2018-03-31 18:54:22 UTC https://padlet.com/tec430/ibk75hfm6iv1/wish/247620030