12th Standard Syllabus & Materials
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Published on: 18/06/2021
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Download Tamil Nadu 12th Standard Physics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Physics Test1.
The de Broglie wavelength associated with an electron accelerated through a potential difference V is λ. What will be its wavelength when the accelerating potential is increased to 4V?
2.
If the intensity of light falling on a metal plate is doubled, what will be the effect on photocurrent and maximum kinetic energy of emitted photoelectrons?
3.
Which of the two :
(i) light or
(ii) moving material particle is concerned with de-Broglie hypothesis?
4.
With what purpose was famous Davisson-Germer experiment with electrons performed?
5.
Does the stopping potential in photoelectric emission depend upon
(i) the intensity of the incident radiation in a photocell
(ii) the frequency of the incident radiation?
1.
\(\lambda =\frac { h }{ \sqrt { 2mqV } } ;\lambda '=\frac { h }{ \sqrt { 2me(4V) } } =\frac { \lambda }{ 2 } \)
2.
As photo current is proportional to intensity of incident light, the photocurrent will be doubled; but the maximum kinetic energy of emitted photoelectrons does not depend upon the intensity of incident light; hence the maximum kinetic energy remains unchanged.
3.
Moving material particle is concerned with de Broglie hypothesis.
4.
Davisson-Germer experiment was performed to verify wave nature of electrons. It is the first experimental evidence for wave nature of matter.
5.
(i) No,
(ii) Yes, stopping potential increases with increases of frequency.
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Tamilnadu Stateboard 12th Standard Subjects
Maths
Chemistry
Physics
Biology
Computer Science
Business Maths and Statistics
Economics
Commerce
Accountancy
History
Computer Applications
Biology
Computer Technology
Computer Applications
Computer Science
Business Maths and Statistics
Commerce
Economics
Maths
Chemistry
Physics
Computer Technology
History
Accountancy
Tamil
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