https://padlet.com/ehoey123/rqwu227l94ix en-us 2017-10-19 19:49:41 UTC 2025-12-10 19:56:35 UTC hello@padlet.com ehoey123 https://padlet.com/ehoey123/rqwu227l94ix/wish/198866354 2017-10-19 20:23:28 UTC https://padlet.com/ehoey123/rqwu227l94ix/wish/198866354 shenderson295 https://padlet.com/ehoey123/rqwu227l94ix/wish/198871187 All waves in the EM Spectrum are transverse, can travel through vacuums and all travel at the same speed in a vacuum. Like other waves, they all move energy from one place to another, all obey the wave equation and can be reflected/refracted.]]> 2017-10-19 20:41:05 UTC https://padlet.com/ehoey123/rqwu227l94ix/wish/198871187 ehoey123 https://padlet.com/ehoey123/rqwu227l94ix/wish/204617902 These were discovered in the 1870s by Hertz, who the unit of frequency was named after. Have the lowest frequency and the longest wavelength. Higher frequency radio waves are used to transmit television programmes and lower frequency radio waves are used to transmit radio programmes.

]]> 2017-11-07 22:35:53 UTC https://padlet.com/ehoey123/rqwu227l94ix/wish/204617902 ehoey123 https://padlet.com/ehoey123/rqwu227l94ix/wish/204621045 Also discovered by Hertz. They come after radio waves on the EM Spectrum. Microwaves were originally used in microwave ovens because the water in food absorbs them causing the food to heat up quickly. They are also used to transmit signals in mobile phones.]]> 2017-11-07 22:52:44 UTC https://padlet.com/ehoey123/rqwu227l94ix/wish/204621045 ehoey123 https://padlet.com/ehoey123/rqwu227l94ix/wish/204621349 The first discovery of electromagnetic radiation (other than visible light) happened in 1800 when James Herschel discovered infrared radiation.]]> 2017-11-07 22:54:39 UTC https://padlet.com/ehoey123/rqwu227l94ix/wish/204621349 shenderson295 https://padlet.com/ehoey123/rqwu227l94ix/wish/206518350 It has a longer wavelength than visible light and a lower frequency. This type of radiation gives off heat so therefore is used in toasters and grills. Night vision cameras and burglar alarms can also detect infrared from living creatures and engines.]]> 2017-11-13 22:47:45 UTC https://padlet.com/ehoey123/rqwu227l94ix/wish/206518350 shenderson295 https://padlet.com/ehoey123/rqwu227l94ix/wish/206518582 The entire range of wavelengths or frequencies of electromagnetic radiation from gamma rays to the longest radio waves and including visible light.]]> 2017-11-13 22:49:07 UTC https://padlet.com/ehoey123/rqwu227l94ix/wish/206518582 ehoey123 https://padlet.com/ehoey123/rqwu227l94ix/wish/206520170 Johann Ritter discovered ultraviolet light in 1801. It has a shorter wavelength than visible light. Ultraviolet light comes from the sun and causes skin to tan. It is also used in tanning beds, security pens and can be used to check whether a bank note is real or not. ]]> 2017-11-13 22:58:32 UTC https://padlet.com/ehoey123/rqwu227l94ix/wish/206520170