photons are incident on a 2 mm lead shield. a) What is the fraction uncollided flux exiting the shield? b) What fraction initially interacts by Photoelectric Effect? c) What fraction initially interacts by Compton Scatter? d) What fraction initially interacts by Pair Production? e) What is the energy of the Compton Edge?

photons are incident on a 2 mm lead shield. a) What is the fraction uncollided flux exiting the shield? b) What fraction initially interacts by Photoelectric Effect? c) What fraction initially interacts by Compton Scatter? d) What fraction initially interacts by Pair Production? e) What is the energy of the Compton Edge?

University Physics Volume 3

17th Edition

ISBN:9781938168185

Author:William Moebs, Jeff Sanny

Publisher:William Moebs, Jeff Sanny

Chapter6: Photons And Matter Waves

Section: Chapter Questions

Problem 11CQ: Explain how you can determine the work function from a plot of the stopping potential versus the...

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Concept explainers

Compton effect

The incoming photons' energy must be in the range of an X-ray frequency to generate the Compton effect. The electron does not lose enough energy that reduces the wavelength of scattered photons towards the visible spectrum. As a result, with visible lights, the Compton effect is missing.

Recoil Velocity

The amount of backward thrust or force experienced by a person when he/she shoots a gun in the forward direction is called recoil velocity. This phenomenon always follows the law of conservation of linear momentum.

Question

A beam of 1.2 MeV photons are incident on a 2 mm lead shield.
a) What is the fraction uncollided flux exiting the shield?
b) What fraction initially interacts by Photoelectric Effect?
c) What fraction initially interacts by Compton Scatter?
d) What fraction initially interacts by Pair Production?
e) What is the energy of the Compton Edge?

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