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標題:
photoelectric
發問:
An FM radio station broadcasts at a frequency of 98.1 MHZ. The power radiated from the antenna is 5.0x10^4W. How many photons per second does the antenna emit??? Thz
最佳解答:
From h = 6.63 x 10-34 J s (Planck's constant) Energy of each photon is: 6.63 x 10-34 x 98.1 x 106 = 6.5 x 10-26 J So in each second. no. of photons emitted is: 5 x 104 / 6.5 x 10-26 = 7.69 x 1029
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其他解答:
thank you, but i don't quite sure how u go from W/J to get the #of photon.... is it becoz I = W/m^2 = E/tA ?
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