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posted by Hannah Thursday, February 9, 2012 at 8:23pm.
What is the frequency of the electromagnetic radiation from outer space that reaches the earth with a wavelength of 1 x 105 m, and a velocity of 1 x 105 m/s?
λ=vT=v/f f= v/λ=1 x 10^5 /1 x 10^5 =1 Hz
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