   Chapter 29, Problem 21PE

Chapter
Section
Textbook Problem

(a) Find the energy in joules and eV of photons in radio waves from an FM station that has a 90.0-MHz broadcast frequency. (b) What does this imply about the number of photons per second that the radio station must broadcast?

To determine

(a)

The energy in joules and eV of photons in radio waves from an FM station that has a 90 MHz broadcast frequency.

Explanation

Given info:

f=90 MHz

h=6.63×1034 Js

Formula used:

For energy in photon in radio waves, the relation between energy and frequency is

Ehf

Calculation:

Substituting the given values of frequency in relation with time, we get

f=1T

Substituting the values, we get

f=9×107pulses/s l

Now energy of radio waves is

E6.63×1034×9×107 JE5

To determine

(b)

This imply about the number of photons per second that the radio station must broadcast.

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