Double Slit Diffraction Quiz

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

True

False

The Double Slit Experiment was first performed by Thomas Young.

Explanation

The Double Slit Experiment was first performed by Thomas Young.

About This Quiz

$Double Slit Diffraction Quiz - Quiz$

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... see morebe presented at the end of the quiz.
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2. All the bright and dark fringes in the double slit diffraction pattern are equally spaced.

True

False

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

Explanation

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

3. 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.

True

False

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.

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.

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

True

False

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

Explanation

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

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

None of the Above

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

Explanation

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

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

True

False

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.

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.

7. When does Double Slit Diffraction Occur?

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

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

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

Both A and B

None of the Above

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.

Explanation

8. 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?

3.24 X 10^-4 m

3.58 X 10^-5 m

4.23 X 10^-4 m

4.48 X 10^-5m

None of the Above

A similar question is done in the sample problems section of this unit.

Explanation

A similar question is done in the sample problems section of this unit.

9. Interfringe represents

Spaces between antinodes in a diffraction pattern

Spaces between nodes in a diffraction pattern

Width of the Central Maximum in Double Slit Diffraction

The interaction between the particle and wave components of light.

Both A and B

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

Explanation

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

10. 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?

28 degrees

34 degrees

16 degrees

18 degrees

None of the Above

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

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