Double Slit Diffraction Quiz

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A short quiz on the key concepts in the Double Slit Diffraction Unit. Just type in your name and start the quiz. Answers to all the questions will be presented at the end of the quiz.

• 1.

When does Double Slit Diffraction Occur?

• A.

When the Slit Width is smaller than λ and distance between Slits is less than λ

• B.

When the Slit Width is larger than λ and distance between slits is bigger than λ

• C.

When the Slit Width is smaller than λ and distance between the slits is slightly more than λ.

• D.

Both A and B

• E.

None of the Above

C. When the Slit Width is smaller than λ and distance between the slits is slightly more than λ.
Explanation
Double Slit Diffraction occurs when the distance between the slits is slightly larger than λ. If the slit width is larger than λ, then single slit diffraction starts occurring and messes up double slit interference.

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• 2.

Which of the following is true for antinodes (maxima) in Double Slit Diffraction?

• A.
• B.
• C.
• D.
• E.

None of the Above

C.
Explanation
The derivation to this is explained on the Double Slit Diffraction page on the website.

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• 3.

Red light of wavelength 600 nm passes through two parallel slits. Nodal lines are produced ona screen 3.0 m away. The distance between the 1st and the 10th nodal lines is 5.0 cm. What is the separation of the two slits?

• A.

3.24 X 10^-4 m

• B.

3.58 X 10^-5 m

• C.

4.23 X 10^-4 m

• D.

4.48 X 10^-5m

• E.

None of the Above

A. 3.24 X 10^-4 m
Explanation
A similar question is done in the sample problems section of this unit.

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• 4.

Interfringe represents

• A.

Spaces between antinodes in a diffraction pattern

• B.

Spaces between nodes in a diffraction pattern

• C.

Width of the Central Maximum in Double Slit Diffraction

• D.

The interaction between the particle and wave components of light.

• E.

Both A and B

B. Spaces between nodes in a diffraction pattern
Explanation
Interfringe stands for the spaces between the nodes or the antinodes in a double slit diffraction pattern.

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• 5.

All the bright and dark fringes in the double slit diffraction pattern are equally spaced.

• A.

True

• B.

False

A. True
Explanation
If it didn't behave like a wave, then you wouldn't see diffraction patterns, therefore it must behave like a wave.

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• 6.

Monochromatic light of wavelength 600nm falls on two parallel narrow slits 400nm apart. A screen is placed 2 meters away. What is the angle of the 3rd order maximum that is created?

• A.

28 degrees

• B.

34 degrees

• C.

16 degrees

• D.

18 degrees

• E.

None of the Above

E. None of the Above
Explanation
Since the distance between the slits is smaller than the wavelength of the light, no diffraction occurs. Therefore none of the answers are possible

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• 7.

The Double Slit Experiment was first performed by Sir Isaac Newton.

• A.

True

• B.

False

B. False
Explanation
The Double Slit Experiment was first performed by Thomas Young.

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• 8.

In Double Slit Interference, there can be an infinite number of dark and bright fringes.

• A.

True

• B.

False

B. False
Explanation
There is always a limited number of dark and bright fringes. This number depends on the maximum value of n which can be calculated by d/λ.

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• 9.

The equations for double slit interference are exactly the opposite as those for diffration gratings

• A.

True

• B.

False

B. False
Explanation
The equations are exactly the same as those for gratings except the value of d is different for gratings.

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• 10.

Double Slit Diffraction doesn't work when the slits are too far apart because all the equations rely on the fact that the distance between the slits is very small compared to the distance between the slits and the screen.

• A.

True

• B.

False

A. True
Explanation
sin(x) = phase difference / d is only true when the distance between the slits is much smaller than the difference between the slits and the screen.

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• Current Version
• Aug 29, 2024
Quiz Edited by
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• Jan 02, 2012
Quiz Created by
Kramayp

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