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Single Slit Diffraction

Total questions: 50

Worksheet time: 34mins

Name
Class
Date
1.

Two beams of coherent light travel different paths, arriving such that they destructively interfere on the screen. The two beams must

a)

arrive in phase

b)

arrive 45-degrees out of phase

c)

arrive 90-degrees out of phase

d)

arrive 180-degrees out of phase

2.

Which would have the widest-spaced fringe pattern for light traveling through a diffraction grating?

a)

large wavelength and a small slit spacing

b)

small wavelength and small slit spacing

c)

large wavelength and a large slit spacing

d)

small wavelength and a large slit spacing

3.

what is diffraction

a)

is a soild liquid gass

b)

is a beam of light that is spread out and passes through an object

c)

a beam of light

4.

A wave of constant wavelength diffracts as it passes through an opening in a barrier. As the size of the opening is increased, the diffraction effects

a)

decrease

b)

increase

c)

remain the same

5.
This image is representing what wave interaction?
a)
Refraction
b)
Diffraction
c)
Reflection
d)
Interference
6.

What happens to the frequency of a wave as it passes through a gap?

a)

Increases

b)

Decreases

c)

No change

d)

None of above

7.

Does the wave speed change after diffraction?Explain it.

a)

Yes. It slows down.

b)

Yes. It speeds up.

c)

No. There is nothing change about the medium.

d)

No. Because the frequency doesn't change.

8.

how does diffraction work

a)

it goes through water and air

b)

is a beam of light stopping at a wall

c)

it bounces off of light

d)

is the bending of light as it passes around the edge of an object

9.

Which diagram best represents the shape and direction of a series of wave fronts after they have passed through a small opening in a barrier?

a)
b)
c)
d)
10.

This diagram shows a series of straight wave fronts produced in a shallow tank of water approaching a small opening in a barrier.

a)
b)
c)
d)
11.

For destructive interference, the path difference is:

a)

odd number of half wavelengths

b)

even number of half wavelengths

c)

whole number of wavelengths

d)

even whole number of wavelengths

12.

What principle is responsible for light spreading as it passes through a narrow slit?

a)

refraction

b)

polarization

c)

diffraction

d)

interference

13.

What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits?

a)

refraction

b)

polarization

c)

diffraction

d)

interference

14.

Two light sources are said to be coherent if they

a)

are of the same frequency.

b)

are of the same frequency, and maintain a constant phase difference.

c)

are of the same amplitude, and maintain a constant phase difference.

d)

are of the same frequency and amplitude.

15.

What would you call this?

a)

Bounce back

b)

Reflection

c)

Diffraction

d)

Refraction

16.

In an experiment, water waves in a ripple tank are incident on a gap, as shown. 

Some diffraction of the water waves is observed. 

Which change to the experiment would provide a better demonstration of diffraction?

a)

Increase the amplitude of the waves.

b)
  1. Increase the frequency of the waves. 

c)

Increase the wavelength of the waves.

d)
  1. Increase the width of the gap. 

17.
  1. Water waves in a ripple tank are made to pass through a small gap, as shown. 

Which diagram shows the waves after they have passed through the gap?

a)

b)

c)

d)

18.

A wave on the surface of water passes through a gap between two barriers and is diffracted, as shown.

What happens when the frequency of the wave is halved?

a)

Less diffraction is observed.

b)

More diffraction is observed.

c)

There is no diffraction.

d)

The same amount of diffraction is observed.

19.

In which situation does diffraction occur?

a)

A wave bounces back from a surface.

b)

A wave passes from one medium into another.

c)

A wave passes through a gap in a barrier.

d)

Waves from two identical sources are superposed.

20.

A sound wave of wavelength 0.50 m passes through a doorway of width 1.0 m between two rooms. Which change increases the amount of diffraction that takes place?

a)

Double the amplitude of the sound wave.

b)

Double the width of the doorway.

c)

Halve the frequency of the sound wave.

d)

Halve the period of the sound wave.

21.

The diagrams show the diffraction of water waves in a ripple tank as they pass through a gap between two barriers. Which diagram is correct?

a)

b)

c)

d)

22.

What is diffraction?

a)

The reflection of a wave off a surface

b)

The bending of a wave as it moves around an obstacle or passes through a narrow opening

c)

The increase in wave amplitude when two waves meet

d)

The change in direction of waves at the boundary between two different media

23.

When does a wave diffract more?

a)

When its frequency is lower than the size of an opening or obstacle

b)

When its wavelength is shorter than the size of an opening or obstacle

c)

When its wavelength is large compared to the size of an opening or obstacle

d)

When its amplitude is higher than the size of an opening or obstacle

24.

What happens to a wave when it passes through a narrow opening?

a)

It reflects and changes direction.

b)

It diffracts, or spreads out.

c)

It stops and does not continue.

d)

It increases in frequency.

25.

The diagram shows a series of wave fronts approaching an opening in a barrier. Point P is located on the opposite side of the barrier. The wave fronts reach point P as a result of

a)

resonance

b)

refraction

c)

reflection

d)

diffraction

26.

A wave is diffracted as it passes through an opening in a barrier. The amount of diffraction that the wave undergoes depends on both the

a)

amplitude and frequency of the incident wave

b)

wavelength and speed of the incident wave

c)

wavelength of the incident wave and the size of the opening

d)

amplitude of the incident wave and the size of the opening

27.

Parallel wave fronts incident on an opening in a barrier are diffracted. For which combination of wavelength and size of opening will diffraction effects be greatest?

a)

short wavelength and narrow opening

b)

short wavelength and wide opening

c)

long wavelength and narrow opening

d)

long wavelength and wide opening

28.

Which one is the intensity distribution for single slit diffraction only?

a)
b)
c)
d)
29.

In single slit diffraction the longer the wavelength

a)

the more the number of slits

b)

the harder it is for light to propagate

c)

the thinner the principal maximum

d)

the wider the pattern

30.

In single slit diffraction, the central maximum

a)

has the same width as the secondary maxima

b)

has thrice the width of the secondary maxima

c)

has twice the width of the secondary maxima

d)

is quite intense compared to the secondary maxima

31.

Diagram shows diffraction of wave.

Which quantity decreases when the water waves diffract?

a)

Speed

b)

Period

c)

Amplitude

d)

Wavelength

32.

In single slit diffraction the longer the wavelength

a)

the more the number of slits

b)

the harder it is for light to propagate

c)

the thinner the principal maximum

d)

the wider the pattern

33.

In a single-slit diffraction experiment, the width of the slit through which light passes is reduced. What happens to the width of the central bright fringe in the resulting diffraction pattern?

a)

The central bright fringe disappears

b)

It becomes narrower

c)

It becomes wider

d)

It stays the same

34.

A single slit is used to create an interference pattern on a screen using light. Consider the statements that follow with respect to the pattern generated:

I. A longer wavelength of light generates a wider central maximum.

II. When using white light, the outer fringes are coloured.

III. A narrower slit generates a wider central maximum.

Which of the above statements is/are correct?

a)

I only

b)

I and II only

c)

I and III only

d)

I, II, and III

e)

II only

35.

A single slit is used to create an interference pattern on a screen using light. Consider the statements that follow with respect to the pattern generated:

I. A longer wavelength of light generates a wider central maximum.

II. When using white light, the outer fringes are coloured.

III. A narrower slit generates a wider central maximum.

Which of the above statements is/are correct?

a)

I only

b)

I and II only

c)

I and III only

d)

I, II, and III

e)

II only

36.

When violet light of wavelength 415nm falls on a single slit, it creates a central diffraction peak that is 9.2 cm wide on a 2.55m away screen. How wide is the slit?

a)

3 X 10^-8 meters

b)

3.8 X 10^-7 meters

c)

2.3 X 10^-7 meters

d)

4.2 X 10^-6 meters

e)

None of the Above

37.

A single slit 1.0mm wide is illuminated by 450nm light. What is the central maximum (in cm) width in the diffraction pattern on a screen 5.0m away?

a)

3 cm

b)

0.8 cm

c)

0.45 cm

d)

0.5 cm

38.

Light of wavelength 2.50 × 102 nm is incident on a slit. If the second order of dark band corresponds to sin θ= 2.50 × 10-3, find the slit width ?

a)

0.02 x 10-3m

b)

1.2 x 10-4m

c)

2 x 10-4m

d)

2.5 x 10-4m

39.

A student and his lab partner create a single slit by carefully aligning two razor blades to a separation of

0.300mm. When a helium–neon laser at 660nm illuminates the slit, a diffraction pattern is observed on a screen 1.25m beyond the slit.Calculate the angle θdark the second minimum in the diffraction pattern.

a)

0.11o

b)

0.21o

c)

0.22o

d)

0.27o

40.

In a single-slit diffraction experiment , a beam of monochromatic light is diffracted by a single slit of width 0.200mm. The diffraction pattern forms on a wall 1.20m beyond the slit. The width of the central maximum is 4.00mm.Calculate the wavelength of the light.

a)

0.008 x 10-6m

b)

0.8 x 10-6m

c)

4.0 x 10-6m

d)

8.0 x 10-6m

41.

When light with a wavelength of 900nm passes through a slit, it forms a second-order dark fringe (m = 2) at θ= 20°.What is the width of the slit?

a)

3.4 x 10-4m

b)

4.0 x 10-5m

c)

4.7 x 10-6m

d)

5.3 x 10-6m

42.

A slit of width a is used to observe a diffraction pattern on a screen at a distance L from the slit.If the width of the slit were doubled, the width of the central bright band would

a)

decrease by a factor of 4

b)

decrease by a factor of 2

c)

increase by a factor of 2

d)

increase by a factor of 4

43.

Light of wave length 3.5x102 nm is incident on a slit of width 0.5mm . Which of the following expressions corresponds to the angle at which the second order minimum is formed

a)

sinθ= 2.2 x 10 -4

b)

sinθ= 3.5 x 10 -4

c)

sinθ= 1.1 x 10 -3

d)

sinθ= 1.4 x 10 -3

44.

Light of wavelength 2. 5 x 10 2nm is incident on a slit of width 0.3 mm. What order of dark band corresponds to

sinθ = 2. 5 x 10 -3

a)

4

b)

3

c)

2

d)

1

45.

Diffraction occurs when light passes through a single slit. Rank the following three choices in decreasing order, according to the extent of the diffraction that occurs (largest diffraction first)

1- Blue light, narrow slit / 2- Red light, narrow slit / 3- Blue light, wide slit

a)

1,2,3

b)

2,1,3

c)

3,1,2

d)

1,3,2

46.

A single slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the wavelength of the illuminating light is doubled?

a)

It will be cut to one -quarter its original size

b)

It will be cut in half

c)

It will double

d)

It will become four times as large

47.

A single slit diffraction pattern is formed on a distant screen . Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the slit width is doubled ?

a)

It will be cut to one -quarter of its original size

b)

it will be cut in half

c)

it will double

d)

It will become four times as large

48.

The figure shows the diffraction pattern by a single slit which has a slit size of 0.017 mm and is placed 80 cm from the screen. The light used has a wavelength of 600 nm. what is the width of the central bright band?

a)

5.65 cm

b)

7.21 cm

c)

6.65 cm

d)

8.34 cm

49.

Light of wavelength 554 nm passes through a single slit of width 5.5 μm. At what angular deviation, as measured from the middle of the central maximum, would the 1st order dark fringes appear on a screen that is 4 meters away?

a)

2.89 degrees

b)

5.78 degrees

c)

1.44 degrees

d)

8.69 degrees

50.

Light of wavelength 554 nm passes through a single slit of width 5.5 μm.


What is the width of the central maximum on the screen that is 4 meters away?

a)

0.20 m

b)

0.40 m

c)

0.81 m

d)

1.21 m