   Chapter 29, Problem 32PE

Chapter
Section
Textbook Problem

Some satellites use nuclear power. (a) If such a satellite emits a 1.00-W flux of γ rays having an average energy of 0.500 MeV, how many are emitted per second? (b) These γ rays affect other satellites. How far away must another satellite be to only receive one γ ray per second per square meter?

To determine

(a)

The number of photons emit per second. Some satellites use nuclear power. If such a satellite emits a 1.00 W flux of γ rays having an average energy of 0.500 MeV .

Explanation

Given info:

p=1.00 W

E=0.50×106 eV

Calculation:

The number of photons per second are emitted by the flux of γ rays the satellite, we get

p=nE

Substituting the given values

n=pE

Substituting the given values of joule in term of electron volt, we get

1J=11.6×1019 eV

n=1

To determine

(b)

The distance far away must another satellite be to only receive one γ ray per second per square meter.

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