Radio wave radiation has frequencies from 3.0×10 5 to 3.0×10 7 Hz, whereas the f
ID: 1025849 • Letter: R
Question
Radio wave radiation has frequencies from 3.0×105 to 3.0×107 Hz, whereas the frequency region for infrared radiation is 3.0×1011 to 3.0×1014 Hz.
We can say that:
1. The speed of radio wave radiation is ____?_____higher thanlower thanthe same as infrared radiation.
2. The wavelength of radio wave radiation is _____?____longer thanshorter thanthe same as infrared radiation.
A local AM radio station broadcasts at an energy of 4.70×10-31 kJ/photon.
Calculate the frequency at which it is broadcasting.
Frequency = ? KHz
(1 KHz = 103 sec -1)
Explanation / Answer
1. The speed of radio wave radiation is same as infrared radiation.
2. The wavelength of radio wave radiation is longer than infrared radiation.
3)
Energy = 4.70 x 10^-31 kJ/photon
= 4.70 x 10^-31 x 10^3
= 4.70 x 10^-28 J
E = h v
4.70 x 10^-28 = 6.625 x 10^-34 x v
v = 7.09 x 10^5 Hz
frequency = 709 kHz
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