NEET-UG SERIES

Physics

Youngs Double Slit Experiment

13 previous year questions.

Volume: 13 Ques

Yield: Medium

High-Yield Trend

3

2024

1

2023

1

2020

1

2018

1

2017

2

2015

1

2014

2

2013

1

1992

Chapter Questions
13 MCQs

01

PYQ 1992

easy

physics ID: neet-ug-

If yellow light emitted by sodium lamp in Young's double slit expt is replaced by monochromatic blue of light of the same intensity

1

fringe width will decrease

2

fringe width will increase

3

fringe width will remain unchanged

4

fringes will becomes less intense

02

PYQ 2013

medium

physics ID: neet-ug-

In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths, =12000 Å and = 10000 Å. At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference patter coincide with a bright fringe from the other?

1

8 mm

2

6 mm

3

4 mm

4

3 mm

03

PYQ 2013

medium

physics ID: neet-ug-

A parallel beam of fast moving electrons is incident normally on a narrow shit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct?

1

Diffraction pattern is not observed on the screen in the case of electrons

2

The angular width of the central maximum of the diffraction pattern will increase

3

The angular width of the central maximum will decrease

4

The angular width of the central maximum will be unaffected

04

PYQ 2014

medium

physics ID: neet-ug-

In the Young's double- slit experiment, the intensity of light at a point on the screen where the path difference is λ is K, (λ being the wave length of light used). The intensity at a point where the path difference is, will be:

1

2

3

Zero

4

K

05

PYQ 2015

hard

physics ID: neet-ug-

In a double slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double slit within the central maxima of single slit pattern?

1

0.5 mm

2

0.02 mm

3

0.2 mm

4

0.1mm

06

PYQ 2015

medium

physics ID: neet-ug-

Two slits in Young's experiment have widths in the ratio 1 : 25. The ratio of intensity at the maxima and minima in the interference pattern, is

1

2

3

4

07

PYQ 2017

medium

physics ID: neet-ug-

Young’s double slit experiment is first performed in air and then in a medium other than air. It is found that 8th bright fringe in the medium lies where 5th dark fringe lies in air. The refractive index of the medium is nearly

1

1.25

2

1.59

3

1.69

4

1.78

08

PYQ 2018

medium

physics ID: neet-ug-

In Young’s double slit experiment the separation d between the slits is 2 mm, the wavelength \lambda of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same \lambda and D) the separation between the slits needs to be changed to

1

1.8mm

2

2.1mm

3

1.9mm

4

1.7mm

09

PYQ 2020

medium

physics ID: neet-ug-

In Young’s double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes :

1

double

2

half

3

four times

4

one-fourth

10

PYQ 2023

hard

physics ID: neet-ug-

For Young's double slit experiment, two statements are given below: Statement I: If screen is moved away from the plane of slits, angular separation of the fringes remians constant. Statement II: If the monochromatic source is replaced by another monochromatic source of larger wavelength, the angular separation of fringes decreases. In the light of the above statements, choose the correct answer from the options given below:

1

Statement I is false but Statement II is true

2

Both Statement I and Statement II are true

3

Both Statement I and Statement II are false

4

Statement I is true but Statement II is false

11

PYQ 2024

medium

physics ID: neet-ug-

A metallic bar of Young’s modulus, 0.5 \times 10 11 N m -2 and coefficient of linear thermal expansion 10 -5 °C -1, length 1 m and area of cross-section 10 -3 m 2 is heated from 0°C to 100°C without expansion or bending. The compressive force developed in it is :

1

5 \times 10 3 N

2

50 \times 10 3 N

3

100 \times 10 3 N

4

2 \times 10 3 N

12

PYQ 2024

medium

physics ID: neet-ug-

The maximum elongation of a steel wire of 1 m length if the elastic limit of steel and its Young’s modulus, respectively, are 8 \times 10 8 N m -2 and 2 \times 10 11 N m -2, is :

1

4 mm

2

0.4 mm

3

40 mm

4

8 mm

13

PYQ 2024

easy

physics ID: neet-ug-

If the monochromatic source in Young's double slit experiment is replaced by white light, 1. There will be a central dark fringe surrounded by a few coloured fringes 2. There will be a central bright white fringe surrounded by a few coloured fringes 3. All bright fringes will be of equal width 4. Interference pattern will disappear

1

interference pattern will disappear.

2

there will be a central dark fringe surrounded by a few coloured fringes

3

there will be a central bright white fringe surrounded by a few coloured fringes.

4

all bright fringes will be of equal width