Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 38 - Quantization - Conceptual Questions - Page 1151: 6

Answer

The electrons from metal 1 have a lower speed than the electrons from metal 2.

Work Step by Step

We can write an expression for the maximum kinetic energy of the electrons: $K_{max} = \frac{h~c}{\lambda} - E_0$ Note that $E_0$ is the work function. If the work function of metal 1 is greater than the work function of metal 2, the electrons from metal 1 will have a lower kinetic energy then the electrons from metal 2. It follows that the electrons from metal 1 have a lower speed than the electrons from metal 2.
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