MHT CET · Physics · Semiconductors
When intensity of incident light increases
- A photo-current increases
- B photo-current decreases
- C kinetic energy of emitted photoelectrons increases
- D kinetic energy of emitted photoelectrons decreases
Answer & Solution
Correct Answer
(A) photo-current increases
Step-by-step Solution
Detailed explanation
According to Einstein's theory of photoelectric effect a single incident photon ejects a single electron. Therefore, when intensity increases, the number of incident photons increases, so number of ejected electrons increases, hence, photocurrent increases.
Now, maximum energy of \(=\frac{1}{2} m v_{\max }^{2}\)
and \(\frac{1}{2} m v_{\max }^{2}=e V_{0}\), where \(V_{0}\) is stopping potential.
Thus, the maximum kinetic energy of the
electrons does not depend upon the intensity
of the incident rays, because the stopping
potential is not affected by the increase of the
intensity of rays.
Now, maximum energy of \(=\frac{1}{2} m v_{\max }^{2}\)
and \(\frac{1}{2} m v_{\max }^{2}=e V_{0}\), where \(V_{0}\) is stopping potential.
Thus, the maximum kinetic energy of the
electrons does not depend upon the intensity
of the incident rays, because the stopping
potential is not affected by the increase of the
intensity of rays.
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