Question

38. A 1 kW radio transmitter operates at a frequency of 880 Hz. How many photons per second does it emit? (A) 1.71 x 1021 (B) 1.71 x 1030 (C) 6.02 x 1023 (D) 2.85 x 1028 Callawing electronic configurations have zero

JEE/Engineering Exams

Chemistry

Solution

132

2.0 (1 ratings)

( begin{aligned} E &=frac{h c}{lambda} &=6.63 times 10^{-34} times 3 times 10^{8} end{aligned} ) Energy q each photon ( begin{aligned} E &=h^{2} &=6.63 times 10^{-3} times 880 lambda & E=10^{4} mathrm{I} text { prisecond } end{aligned} ) ( n=frac{10^{4}}{6.63 times 10^{-34} times 880} ) ( =1.7 times 10^{34} ) photens