Electromagnetic Spectrum by Chee Yong Ronnie Teo https://padlet.com/teo_chee_yong_ronnie/Bookmarks Components of EM Waves en-us 2021-08-24 12:17:55 UTC 2025-08-26 01:46:17 UTC hello@padlet.com Eva, Farnita & Wendy teo_chee_yong_ronnie https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2522191376 Research the following for this wave:
1. What is the speed in vacuum?
2. What is the frequency of this wave?
3. State 2 uses of this wave.
4. State 1 bad effect of this wave.]]> 2023-03-19 13:07:23 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2522191376 Siti & Ezlynn, Eva teo_chee_yong_ronnie https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2522665485 Research the following for this wave:
1. What is the speed in vacuum?
2. What is the frequency of this wave?
3. State 2 uses of this wave.
4. State 1 bad effect of this wave.]]> 2023-03-20 01:02:48 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2522665485 Serlina, Serena, Chuan Yi teo_chee_yong_ronnie https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2522665615 Research the following for this wave:
1. What is the speed in vacuum?
2. What is the frequency of this wave?
3. State 2 uses of this wave.
4. State 1 bad effect of this wave.]]> 2023-03-20 01:02:54 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2522665615 Kian Hao, Ted teo_chee_yong_ronnie https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2522665696 Research the following for this wave:
1. What is the speed in vacuum?
2. What is the frequency of this wave?
3. State 2 uses of this wave.
4. State 1 bad effect of this wave.]]> 2023-03-20 01:03:00 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2522665696 Alif, Hirmin & Ryan teo_chee_yong_ronnie https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2522665835 Research the following for this wave:
1. What is the speed in vacuum?
2. What is the frequency of this wave?
3. State 2 uses of this wave.
4. State 1 bad effect of this wave.]]> 2023-03-20 01:03:08 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2522665835 Aniq, Jamsith, Neela teo_chee_yong_ronnie https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2522665969 Research the following for this wave:
1. What is the speed in vacuum?
2. What is the frequency of this wave?
3. State 2 uses of this wave.
4. State 1 bad effect of this wave.]]> 2023-03-20 01:03:14 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2522665969 Haziqah, Jia Yi, Fasha teo_chee_yong_ronnie https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2522666057 Research the following for this wave:
1. What is the speed in vacuum?
2. What is the frequency of this wave?
3. State 2 uses of this wave.
4. State 1 bad effect of this wave.]]> 2023-03-20 01:03:19 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2522666057 https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526448787 1. 299 792 458 metres per second.]]> 2023-03-22 02:57:41 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526448787 https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526451550 1. Gamma Rays speed is 2.99792458x10 8m/s
2. Gamma rays frequency is 3x 10 18 Hz to 5x10 22 Hz
3. Is to treat bone  and brain cancer 
4. They can cause ionizations that damage tissue and DNA]]> 2023-03-22 02:59:44 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526451550 Hirmin https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526458823 1) 299,792,458 metres per second
2)Infrared (IR) has wavelengths λ between 780 nm and 1 mm, which corresponds to a frequency range from 300 GHz to 400 THz.
3)We use infrared radiation in many ways, including thermal imaging cameras, remote controls, fiber optic cables, infrared astronomy, and meteorology. The fact that water vapor and other greenhouses gases absorb infrared is part of why the greenhouse effect happens.
4)Prolonged exposure to IR radiation causes a gradual but irreversible opacity of the lens. Other forms of damage to the eye from IR exposure include scotoma, which is a loss of vision due to the damage to the retina. Even low-level IR absorption can cause symptoms such as redness of the eye, swelling, or hemorrhaging.]]> 2023-03-22 03:05:02 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526458823 Research https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526460765 1. Ultraviolet waves are incapable of travelling through vacuum, these waves can travel at the speed of sound of 300,000,000 metres per second in a vacuum
2.The frequency of a Ultraviolet wave between wavelengths of about 400 nanometres and 10 nanometres, corresponding to frequencies of 7.5 × 1014 Hz to 3 × 1016 Hz.
3.The UV radiation is widely used in industrial processes and in medical and dental practices for a variety of purposes, such as killing bacteria, creating fluorescent effects, curing inks and resins, phototherapy and suntanning.
4.Sunburn is a sign of short-term overexposure, while premature aging and skin cancer are side effects of prolonged UV exposure. UV exposure increases the risk of potentially blinding eye diseases, if eye protection is not used. Overexposure to UV radiation can lead to serious health issues, including cancer.]]> 2023-03-22 03:06:18 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526460765 Science https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526461378 299,775 km/s
It is shown first that, for radio waves in a vacuum, their speed of transmission is equal to the velocity of light (299,775 km/s), to within the limits of experimental error.
]]> 2023-03-22 03:06:48 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526461378 Is https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526461942 The range of the radio spectrum is considered to be 3 kilohertz up to 300 gigahertz. A radio wave is generated by a transmitter and then detected by a receiver.]]> 2023-03-22 03:07:14 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526461942 https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526463466 1.X-rays speed is about 3000,000 km, or 186,000 miles, per second
2.X-rays frequency is 30 petahertz to 30 exahertz(31016 Hz to 31019 Hz)
3. Some tyes of injuries and dental problems
4. A small increase in the possibility that a perwson exposed to X-rays will develop cancer later in life]]> 2023-03-22 03:08:24 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526463466 Boring https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526463753 Various frequencies of radio waves are used for television and FM and AM radio broadcasts, military communications, mobile phones, ham radio, wireless computer networks, and numerous other communications applications.]]> 2023-03-22 03:08:38 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526463753 & useless https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526464271 It has been said that large doses of radio waves can cause cancer, leukemia as well as other disorders. Some people have also claimed that overhead power cables near their homes which causes a very low-frequency field also can harm their health.]]> 2023-03-22 03:09:04 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526464271 https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526469779 1) 299,792,458 metres per second
speed of light, speed at which light waves propagate through different materials. In particular, the value for the speed of light in a vacuum is now defined as exactly 299,792,458 metres per second
]]> 2023-03-22 03:13:25 UTC https://padlet.com/teo_chee_yong_ronnie/Bookmarks/wish/2526469779