ELECTROMAGNETIC WAVES by Maegan Richardson https://padlet.com/12286423/9qh2gtawcnl6 MAEGAN RICHARDSON en-us 2016-12-19 18:12:31 UTC 2023-04-05 10:15:51 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Planets.png Waves 12286423 https://padlet.com/12286423/9qh2gtawcnl6/wish/144363750 When we think of the word "wave" we usually picture someone moving their hand back and forth to say hello or maybe we think of a tall curling wall of water moving in from the ocean to crash on the beach. 


]]> 2016-12-19 18:16:58 UTC https://padlet.com/12286423/9qh2gtawcnl6/wish/144363750 12286423 https://padlet.com/12286423/9qh2gtawcnl6/wish/144364308 ELECTROMAGNETIC WAVES
Electromagnetic waves are a form of energy waves that have both an electric and magnetic field. Electromagnetic waves are different from mechanical waves in that they can transmit energy and travel through a vacuum. Electromagnetic waves are classified according to their frequency. The different types of waves have different uses and functions in our everyday lives. The most important of these is visible light, which enables us to see.


]]> 2016-12-19 18:19:28 UTC https://padlet.com/12286423/9qh2gtawcnl6/wish/144364308 TRANSVERSE WAVES 12286423 https://padlet.com/12286423/9qh2gtawcnl6/wish/144364621 where the disturbance moves perpendicular to the direction of the wave. You can think of the wave moving left to right, while the disturbance moves up and down. One example of a transverse wave is a water wave where the water moves up and down as the wave passes through the ocean. Other examples include an oscillating string and a wave of fans in a stadium (the people move up and down while the wave moves around the stadium). ]]> 2016-12-19 18:21:01 UTC https://padlet.com/12286423/9qh2gtawcnl6/wish/144364621 LONGITUDINAL WAVES 12286423 https://padlet.com/12286423/9qh2gtawcnl6/wish/144365401 where the disturbance moves in the same direction as the wave. One example of this is a wave moving through a stretched out slinky or spring. If you compress one portion of the slinky and let go, the wave will move left to right. At the same time, the disturbance (which is the coils of the springs moving), will also move left to right. Another classic example of a longitudinal wave is sound. As sound waves propagate through a medium, the molecules collide with each other in the same direction as the sound is moving. 


]]> 2016-12-19 18:24:45 UTC https://padlet.com/12286423/9qh2gtawcnl6/wish/144365401 WAVELENGTH 12286423 https://padlet.com/12286423/9qh2gtawcnl6/wish/144366529 -The distance from two corresponding (or the same) parts of a wave.]]> 2016-12-19 18:29:26 UTC https://padlet.com/12286423/9qh2gtawcnl6/wish/144366529 FREQUENCY 12286423 https://padlet.com/12286423/9qh2gtawcnl6/wish/144367090 How many waves can pass a given point per second, measured in Hertz (Hz)]]> 2016-12-19 18:32:00 UTC https://padlet.com/12286423/9qh2gtawcnl6/wish/144367090 RADIO WAVES 12286423 https://padlet.com/12286423/9qh2gtawcnl6/wish/144367887 In physics, a wave is a traveling disturbance that travels through space and matter transferring energy from one place to another. When studying waves it's important to remember that they transfer energy, not matter.
.]]> 2016-12-19 18:35:36 UTC https://padlet.com/12286423/9qh2gtawcnl6/wish/144367887 MICROWAVES 12286423 https://padlet.com/12286423/9qh2gtawcnl6/wish/144368273 Microwaves are shorter than radio waves with wavelengths measured in centimeters. We use microwaves to cook food, transmit information, and in radar that helps to predict the weather. Microwaves are useful in communication because they can penetrate clouds, smoke, and light rain. The universe is filled with cosmic microwave background radiation that scientists believe are clues to the origin of the universe they call the Big Bang. ]]> 2016-12-19 18:37:25 UTC https://padlet.com/12286423/9qh2gtawcnl6/wish/144368273 INFRARED Between microwaves and visible light are infrared waves. Infrared waves are sometimes classified as "near" infrared and "far" infrared. Near infrared waves are the waves that are closer to visible light in wavelength. These are the infrared waves that are used in your TV remote to change channels. Far infrared waves are further away from visible light in wavelength. Far infrared waves are thermal and give off heat. Anything that gives off heat radiates infrared waves. This includes the human body! 12286423 https://padlet.com/12286423/9qh2gtawcnl6/wish/144368537   ]]> 2016-12-19 18:38:36 UTC https://padlet.com/12286423/9qh2gtawcnl6/wish/144368537 VISIBLE LIGHT 12286423 https://padlet.com/12286423/9qh2gtawcnl6/wish/144368686 The visible light spectrum covers the wavelengths that can be seen by the human eye. This is the range of wavelengths from 390 to 700 nm which corresponds to the frequencies 430-790 THz. You can go here to learn more about the visible spectrum. 


]]> 2016-12-19 18:39:21 UTC https://padlet.com/12286423/9qh2gtawcnl6/wish/144368686 ULTRAVIOLET 12286423 https://padlet.com/12286423/9qh2gtawcnl6/wish/144368903 Ultraviolet waves have the next shortest wavelength after visible light. It is ultraviolet rays from the Sun that cause sunburns. We are protected from the Sun's ultraviolet rays by the ozone layer. Some insects, such as bumblebees, can see ultraviolet light. Ultraviolet light is used by powerful telescopes like the Hubble Space Telescope to see far away stars. ]]> 2016-12-19 18:40:27 UTC https://padlet.com/12286423/9qh2gtawcnl6/wish/144368903 X-rays X-rays have even shorter wavelengths than ultraviolet rays. At this point in the electromagnetic spectrum, scientists begin to think of these rays more as particles than waves. X-rays were discovered by German scientist Wilhelm Roentgen. They can penetrate soft tissue like skin and muscle and are used to take X-ray pictures of bones in medicine. 12286423 https://padlet.com/12286423/9qh2gtawcnl6/wish/144369418 2016-12-19 18:42:57 UTC https://padlet.com/12286423/9qh2gtawcnl6/wish/144369418 GAMMA RAYS As the wavelengths of electromagnetic waves get shorter, their energy increases. Gamma rays are the shortest waves in the spectrum and, as a result, have the most energy. Gamma rays are sometimes used in treating cancer and in taking detailed images for diagnostic medicine. Gamma rays are produced in high energy nuclear explosions and supernovas. 12286423 https://padlet.com/12286423/9qh2gtawcnl6/wish/144369562 2016-12-19 18:43:41 UTC https://padlet.com/12286423/9qh2gtawcnl6/wish/144369562