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Answer :
1) We know that the speed of electromagnetic waves is 3 x 10⁸ m/s
v = fλ
f = v/λ
f = (3 x 10⁸)/0.07
f = 4.3 x 10⁹ Hz
2) Far from the source, photons spread over a larger area. This is why the intensity of light decreases as we get further from its source.
3) A shorter wavelength means a higher energy. On the electromagnetic spectrum, the less energetic waves than Infrared wavers are Radio waves.
v = fλ
f = v/λ
f = (3 x 10⁸)/0.07
f = 4.3 x 10⁹ Hz
2) Far from the source, photons spread over a larger area. This is why the intensity of light decreases as we get further from its source.
3) A shorter wavelength means a higher energy. On the electromagnetic spectrum, the less energetic waves than Infrared wavers are Radio waves.
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