Electromagnetic spectrum (7.4)
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4 Terms
1
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How do EM waves travel?
They all travel at the same speed in free space and at the speed of light (3.0 × 108 ms-1) in a vacuum.
2
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What is the order of EM waves from longest wavelength to shortest?
1) Radio waves
2) Microwaves
3) Infrared
4) Visible light - Red, Orange, Yellow, Green, Blue, Indigo, Violet
5) Ultraviolet
6) X-rays
7) Gamma rays
3
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What is the wavelength for each type of EM wave?
EM wave | Wavelength/m |
Radio | 103 |
Microwave | 10-2 |
Infrared | 10-5 |
Visible light | 10-7 |
Ultraviolet | 10-8 |
X-ray | 10-10 |
Gamma ray | 10-12 |
4
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What is the range of wavelengths visible to the human eye?
400-700nm
Note 
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