12th Standard CBSE Syllabus & Materials
12th Standard CBSE
CBSE 12th Economics Government Budget and the Economy Previous year Question Papers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Computer Science Interface Python with MySQL - New Previous year Question Papers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Computer Science Database Concept - New Previous year Question Papers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Computer Science Data Communication - New Previous year Question Papers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Computer Science Data Structures - New Previous year Question Papers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Computer Science Functions - New Previous year Question Papers Study Material - QB365 Set A
Published on: 27/05/2021
QB365 Provides the HOT Question Papers for Class 12 Physics, and also provide the detail solution for each and every HOT Questions. HOT Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams
Download CBSE Class 12th Standard CBSE Physics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Physics
Questions + Answers key
Take MCQ Physics Test1.
Alkali metals are most suitable for photoelectric emission. Why?
2.
If wavelength of electromagnetic waves are doubled what will happen to energy of photon?
3.
Show graphically how the stopping potential for a given photosensitive surface varies with the frequency of incident radiations.
4.
A photon and an electron have been same de-Broglie wavelength which one has higher total energy?
5.
The stopping potential in an experiment on a photoelectric effect is 1.5V. What is the maximum kinetic energy of the photoelectrons emitted?
1.
Alkali metals have too low work functions. Even visible light can eject electrons from them.
2.
\(E=h v,\)
\(
=\mathrm{hc} / \lambda \\
\mathrm{E} \infty 1 / \lambda
\)
3.
4.
Total energy of an electron Ee = mc2
Total energy of a photon, \(E_p=\frac{h c}{\lambda}\)
de-Broglie wavelength of electron of mass m moving with velocity V
\(
\lambda=\frac{h}{m v} \\
\Rightarrow m=\frac{h}{\lambda v}
\)
\(E_e=m c^2=\frac{h c^2}{\lambda v}\)
\(\therefore \frac{E_e}{E_p}=\frac{\frac{h_0^2}{\lambda v}}{\frac{h o}{\lambda}}=\frac{c}{v}\)
As c > > v, therefore the total energy of electron is more than the total energy of photon.
5.
\(M a x . K . E .=K_{\max }=e V_0=e \times 1.5 \mathrm{~V}=1.5 \mathrm{eV}\)
12th Standard CBSE Syllabus & Materials
12th Standard CBSE
CBSE 12th Computer Science Python Revision Tour I - New Previous year Question Papers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Business Studies Planning Important Questions And Answers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Business Studies Business Environment Important Questions And Answers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Business Studies Principles of Management Important Questions And Answers Study Material - QB365 Set A
NCERT Books
Syllabus
Exam Pattern
Sample Question Papers
Previous year Question Papers
Important Notes
MCQ Practice test
NCERT Exemplers
Case study Questions
Image Based Questions
Passage based Questions
HOT Questions
Value Based Questions
Model Questions Papers
NCERT ( Book Back ) Questions
Assertion and Reason
Important Questions And Answers
CBSE 12th Standard CBSE Subjects
CBSE Standards
