Concept explainers
To Plot: The stopping potential versus frequency.
To Find: The work function, the threshold wavelength, and the value of
Answer to Problem 73A
Work function is
Threshold wave length is
Value of
Explanation of Solution
Given data:
Wavelength | Stopping potential |
200 | 4.20 |
300 | 2.06 |
400 | 1.05 |
500 | 1.01 |
600 | 0.03 |
Formula used:
Frequency can be calculated as:
By Einstein’s photoelectric equation: -
Calculation:
Wavelength | Frequency |
200 | |
300 | |
400 | |
500 | |
600 |
From the above table graph can be drawn as:
The photoelectric equation can be written as:
Here, the stopping potential is the function of the frequency.
Taking stopping potential on y axis and frequency on x axis, equation can be written as:
From the above graph, slope can be determined as:
The equation can be written as:
To find the work function
Or
Now, the relation between the threshold, frequency and work function is:
Now,
The accepted value of
Now,
Experimental and expected values are approximately equal.
Conclusion:
Experimental and expected values are approximately equal.
Chapter 27 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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