GATE PH topic:physics PYQs & Answers — Page 30

Questions 291–300 of 650. Imported answers require independent review unless marked reviewed.

Electric field is measured along the axis of a uniformly charged disc of radius 25 cm. At a distance

from the centre, the field differs by 10% from that of an infinite plane having the same charge density. The value of

is ______ cm. (Round off to one decimal place)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In a solid, a Raman line observed at

has intensity of Stokes line four times that of the anti-Stokes line. The temperature of the sample is ______ K. (Round off to the nearest integer) (

)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

An electromagnetic pulse has a pulse width of

. The uncertainty in the momentum of the corresponding photon is of the order of

, where

is an integer. The value of

is __________ (speed of light

)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The wavefunction of a particle in a one-dimensional infinite well of size

at a certain time is

. Probability of finding the particle in

state at that time is ______% (Round off to the nearest integer)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A spectrometer is used to detect plasma oscillations in a sample. The spectrometer can work in the range of

. The minimum carrier concentration that can be detected by using this spectrometer is

. The value of

is __________ (Round off to two decimal places)

(Charge of an electron

, mass of an electron

and

)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider a non-interacting gas of spin 1 particles, each with magnetic moment

, placed in a weak magnetic field

, such that

. The average magnetic moment of a particle is

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Water at 300 K can be brought to 320 K using one of the following processes.

Process 1: Water is brought in equilibrium with a reservoir at 320 K directly.

Process 2: Water is first brought in equilibrium with a reservoir at 310 K and then with the reservoir at 320 K.

Process 3: Water is first brought in equilibrium with a reservoir at 350 K and then with the reservoir at 320 K.

The corresponding changes in the entropy of the universe for these processes are

and

, respectively. Then

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A student sets up Young’s double slit experiment with electrons of momentum

incident normally on the slits of width

separated by distance

. In order to observe interference fringes on a screen at a distance

from the slits, which of the following conditions should be satisfied?

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider a particle in three different boxes of width

. The potential inside the boxes are as shown in figures (i), (ii) and (iii) with

. The corresponding ground-state energies of the particle are

and

, respectively. Then

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In cylindrical coordinates

, which of the following is a Hermitian operator?

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE PH topic:physics PYQs

Question 31

Question 32

Question 33

Question 34

Question 35

Question 36

Question 37

Question 38

Question 39

Question 40