Concept explainers
(a) To determine:
Maximum kinetic energy of the ejected electrons.
Answer to Problem 25P
Solution:
Maximum kinetic energy of the ejected electrons is .
Explanation of Solution
Given:
Threshold wavelength,
Given
Formula used:
The maximum kinetic energy of the photon is calculated as
Here,
is the charge of electron
is the Planck’s constant
is the speed of light
is the given wavelength
is the threshold wavelength
Calculation:
The maximum kinetic energy of the photon is calculated as
Plugging the values in the above equation
(b) To determine:
Maximum kinetic energy of the ejected electrons
Answer to Problem 25P
Solution:
Maximum kinetic energy of the ejected electrons is .
Explanation of Solution
Given:
Threshold wavelength,
Given wavelength of light,
Formula used:
The maximum kinetic energy of the photon is calculated as
Here,
is the charge of electron
is the Planck’s constant
is the speed of light
is the given wavelength
is the threshold wavelength
Calculation:
The maximum kinetic energy of the photon is calculated as
Plugging the values in the above equation
The negative sign indicates that, the photon will not have the enough energy to eject the electron from the metal surface; therefore, no electron will be ejected from the surface of metal,
Chapter 27 Solutions
Physics: Principles with Applications
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