   Chapter 29, Problem 45PE

Chapter
Section
Textbook Problem

(a) Find the momentum of a 100-keV x-ray photon. (b) Find the equivalent velocity of a neutron with the same momentum. (c) What is the neutron's kinetic energy in keV?

To determine

(a)

The momentum of a 100-keV x-ray photon.

Explanation

Given info:

E100 keV

c 3×108 ms1

Formula used:

For energy in proton , the relation between energy and velocity is

Epc

Or

pEc

Calculation:

Substituting the given values of joule in eV relation, we get

1eV= 1.6×1019 J

Now Energy of photon is

E100×103×1.6×1019 eVE 1

To determine

(b)

The equivalent velocity of a neutron with the same momentum.

To determine

(c)

The neutron's kinetic energy in keV.

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