Concept explainers
The metal which will not emit electrons, when visible light shines on it?
Answer to Problem 20P
Solution:
The metals which will not emit electrons are copper and iron.:
Explanation of Solution
Given:
Work function of sodium,
Work function of cesium,
Work function of copper,
Work function of iron,
Wavelength range of visible spectrum,
Formula used:
The work function is calculated by the formula
Here,
is the charge of electron
is the Planck’s constant
is the speed of light
is the wavelength
Calculation:
The wave function is defined as the minimum energy required by the photon to emit electron from the metal surface.
The maximum energy that visible electron can supply to any metal is calculated as
Plugging the values in the above equation
The metal whose work function is greater than the energy supplied by the visible spectrum will not emit electron.
Since it’s clear that
Thus, copper and iron will not emit electron when light of visible spectrum strikes on the metal.
Chapter 27 Solutions
Physics: Principles with Applications
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