JEE Main 2012 | Dual Nature of Radiation Question 1 | Physics

JEE Main 2012

MCQ (Single Correct Answer)

-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.

Statement 1 is false, Statement 2 is true.

Statement 1 is true, Statement 2 is false

Statement 1 is true, Statement 2 is true, Statement 2 is the correct explanation of statement 1

Statement 1 is true, Statement 2 is true, Statement 2 is not the correct explanation of Statement 1

JEE Main 2023 (Online) 1st February Evening Shift

MCQ (Single Correct Answer)

-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 :

$$\frac{v_{1}}{v_{2}}=\frac{1}{2}$$

$$\frac{v_{1}}{v_{2}}=\frac{1}{16}$$

$$\frac{v_{1}}{v_{2}}=\frac{1}{4}$$

$$\frac{v_{1}}{v_{2}}=\frac{1}{8}$$

JEE Main 2023 (Online) 31st January Evening Shift

MCQ (Single Correct Answer)

-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.

Metal B will not emit photo-electrons

Both metals $\mathrm{A}$ and $\mathrm{B}$ will not emit photo-electrons

Metal A will not emit photo-electrons

Both metals A and B will emit photo-electrons

JEE Main 2023 (Online) 31st January Morning Shift

MCQ (Single Correct Answer)

-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 is not correct but R is correct.