1
JEE Main 2012
MCQ (Single Correct Answer)
+4
-1
This equation has Statement 1 and Statement 2. Of the four choices given after the statements, choose the one that describes the two statements.

Statement 1: Davisson-Germer experiment established the wave nature of electrons.

Statement 2 : If electrons have wave nature, they can interfere and show diffraction.
A
Statement 1 is false, Statement 2 is true.
B
Statement 1 is true, Statement 2 is false
C
Statement 1 is true, Statement 2 is true, Statement 2 is the correct explanation of statement 1
D
Statement 1 is true, Statement 2 is true, Statement 2 is not the correct explanation of Statement 1
2
JEE Main 2023 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-1

The threshold frequency of a metal is $$f_{0}$$. When the light of frequency $$2 f_{0}$$ is incident on the metal plate, the maximum velocity of photoelectrons is $$v_{1}$$. When the frequency of incident radiation is increased to $$5 \mathrm{f}_{0}$$, the maximum velocity of photoelectrons emitted is $$v_{2}$$. The ratio of $$v_{1}$$ to $$v_{2}$$ is :

A
$$\frac{v_{1}}{v_{2}}=\frac{1}{2}$$
B
$$\frac{v_{1}}{v_{2}}=\frac{1}{16}$$
C
$$\frac{v_{1}}{v_{2}}=\frac{1}{4}$$
D
$$\frac{v_{1}}{v_{2}}=\frac{1}{8}$$
3
JEE Main 2023 (Online) 31st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
If the two metals $\mathrm{A}$ and $\mathrm{B}$ are exposed to radiation of wavelength $350 \mathrm{~nm}$. The work functions of metals $\mathrm{A}$ and $\mathrm{B}$ are $4.8 \mathrm{eV}$ and $2.2 \mathrm{eV}$. Then choose the correct option.
A
Metal B will not emit photo-electrons
B
Both metals $\mathrm{A}$ and $\mathrm{B}$ will not emit photo-electrons
C
Metal A will not emit photo-electrons
D
Both metals A and B will emit photo-electrons
4
JEE Main 2023 (Online) 31st January Morning Shift
MCQ (Single Correct Answer)
+4
-1

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R

Assertion A : The beam of electrons show wave nature and exhibit interference and diffraction.

Reason R : Davisson Germer Experimentally verified the wave nature of electrons.

In the light of the above statements, choose the most appropriate answer from the options given below :

A
A is not correct but R is correct.
B
Both A and R are correct and R is the correct explanation of A
C
Both A and R are correct but R is Not the correct explanation of A
D
A is correct but R is not correct
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
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Physical Chemistry
Inorganic Chemistry
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