Physics Chart Class 12. We covered all the Physics Chart Class 12 MCQs in this post for free so that you can practice well for the exam.
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Physics Chart Class 12 Objective for Students
The minimum energy required for the emission of photoelectron from a metal is called
(a) work function
(b) stopping potential
(c) frequency
(d) None of the above
Option a – work function
The stopping potential for photoelectrons depends
(a) on the intensity of the incident light.
(b) on the frequency of the incident light and the cathode materials.
(c) only on the cathode materials.
(d) only on the frequency of the incident light.
Option b – on the frequency of the incident light and the cathode materials
The threshold frequency of material is
(a) the minimum frequency of light which can emit photoelectrons from materials.
(b) the maximum frequency of light which can emit photoelectrons from materials.
(c) The minimum energy required for the emission of photoelectron from a material.
(d) None of the above
Option a – the minimum frequency of light which can emit photoelectrons from materials
In photoelectric effect, the number of photoelectrons emitted is proportional to
(a) velocity of incident beam.
(b) work function of photo cathode.
(c) frequency of incident beam.
(d) intensity of incident beam.
Option d – intensity of incident beam
Photoelectric effect can be explained by assuming that light
(a) can be polarized.
(b) consists of quanta.
(c) is a form of transverse wave.
(d) is a form of longitudinal wave.
Option b – consists of quanta
Which one of the following metal is used in the filaments of photoelectric cells that converts light energy into electric energy?
(a) Tungsten
(b) Copper
(c) Rubidium
(d) Aluminium
Option a – Tungsten
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