# Worksheet: Single-Slit Diffraction

In this worksheet, we will practice calculating light intensities of different wavelengths at variable angles relative to a single-slit's transmission axis.

**Q1: **

A single slit of width 0.20 mm is illuminated by light of 400 nm wavelength. The diffracted light falls on a screen. In the pattern formed on the screen, the second minimum of the diffracted light is a distance of 2.5 mm from the central maximum. What is the distance between the slit and the screen?

**Q3: **

At what angle is the first minimum for 550-nm light falling on a single slit of width 1.00 μm?

**Q4: **

A microwave of an unknown wavelength is incident on a single slit of width 6.0 cm. The angular width of the central peak is found to be . Find the wavelength.

**Q5: **

A single slit of width 3.9 μm is illuminated by light of wavelength 589 nm. Find the light intensity at an angle of to the central axis of the transmitted light, expressing the intensity in terms of the intensity of the central maximum.

- A
- B
- C
- D
- E

**Q6: **

A single slit of width 0.10 mm is illuminated by light of wavelength 576 nm. Find the light intensity at an angle of to the central axis of the transmitted light, expressing the intensity in terms of the intensity of the central maximum.

- A
- B
- C
- D
- E

**Q7: **

Find the wavelength of light that has its third minimum at an angle of when it falls on a single slit of width 3.00 μm.

**Q8: **

Suppose that the central peak of a single-slit diffraction pattern is so wide that the first minima can be assumed to occur at angular positions of . For this case, what is the ratio of the slit width to the wavelength of the light?

- A
- B
- C
- D
- E

**Q9: **

If the separation between the first and the second minima of a single-slit diffraction pattern is 6.00 mm, what is the distance between the screen and the slit? The light wavelength is 500 nm and the slit width is 0.160 mm.

**Q10: **

A single-slit diffraction pattern for light with a wavelength is projected onto a screen that is 1.00 m away from a slit of width 0.25 mm.

How far from the centre of the pattern is the centre of the first dark fringe?

- A 2.1 mm
- B 1.8 mm
- C 2.8 mm
- D 2.4 mm
- E 3.3 mm

How far from the centre of the pattern is the centre of the second dark fringe?

- A 4.7 mm
- B 4.0 mm
- C 3.3 mm
- D 2.4 mm
- E 5.5 mm

**Q11: **

Monochromatic light of wavelength 530 nm passes through a horizontal single slit of width 1.5 μm in an opaque plate. A screen of dimensions is 1.2 m away from the slit.

What is the angle with respect to the centre of the diffraction pattern of the first minimum of intensity observed?

- A
- B
- C
- D
- E

What is the angle with respect to the centre of the diffraction pattern of the second minimum of intensity observed?

- A
- B
- C
- D
- E

What is the angle with respect to the centre of the diffraction pattern of the first maximum of intensity observed?

- A
- B
- C
- D
- E

What is the angle with respect to the centre of the diffraction pattern of the second maximum of intensity observed?

- A
- B
- C
- D
- E

What is the angle with respect to the centre of the diffraction pattern of the third maximum of intensity observed?

- A
- B
- C
- D
- E

How wide is the central bright fringe on the screen?

- A 75 cm
- B 110 cm
- C 64 cm
- D 89 cm
- E 93 cm

How wide is the first bright fringe on the screen that is separated from the central bright fringe by a dark fringe?

- A 110 cm
- B 71 cm
- C 62 cm
- D 99 cm
- E 88 cm

**Q12: **

How many times the wavelength of a wave is the minimum width of a single slit that will produce a diffraction pattern containing a first minimum?

How many times the wavelength of a wave is the minimum width of a single slit that will produce a diffraction pattern containing 50 minima?

How many times the wavelength of a wave is the minimum width of a single slit that will produce a diffraction pattern containing minima?

**Q13: **

Equal intensities of 550 nm and 600 nm wavelength light are incident on a slit of width 1.8 μm. Find the separation of the bright spots for the two wavelengths on a screen 30.0 cm away.

**Q14: **

A doorway of width 1.0 m acts as an aperture that diffracts both light and sound.

What is the angular position of the first minimum in the diffraction pattern of 600-nm light passing through the doorway?

- A
- B
- C
- D
- E

What is the angular position of the first minimum in the diffraction pattern of 440-Hz-frequency sound passing through the doorway at a speed of 343 m/s?

- A
- B
- C
- D
- E

**Q15: **

Light of wavelength m is diffracted by a single slit of width 0.025 mm. The diffracted light is incident on a screen 2.0 m from the slit. The intensity of the light in the diffraction pattern for different values of the diffraction angle can be expressed in terms of the intensity of the central maximum .

What is the intensity for .

- A
- B
- C
- D
- E

What is the intensity for .

- A
- B
- C
- D
- E

What is the intensity for .

- A
- B
- C
- D
- E

What is the intensity for .

- A
- B
- C
- D
- E

What is the intensity for .

- A
- B
- C
- D
- E

**Q16: **

An aircraft maintenance technician walks past a tall hangar door that acts like a single slit for sound entering the hangar. Outside the door, on a line perpendicular to the opening in the door, a jet engine makes a 600-Hz sound. At what angle with the door will the technician observe the first minimum in sound intensity if the vertical opening is 0.800 m wide and the speed of sound is 340 m/s?

**Q17: **

A single slit produces its first minimum for 633-nm-wavelength light at an angle of .

How wide is the slit?

- A m
- B m
- C m
- D m
- E m

At what angle will the second minimum be?

**Q18: **

A slit is 3.00 μm wide. At what angle does the slit produce a first-order minimum for 410 nm wavelength light?

**Q19: **

A slit is 4.00 μm wide. At what angle does the slit produce a third-order minimum for 700 nm wavelength light?

**Q20: **

Find the width of a single slit that produces a second-order minimum at for 650 nm wavelength light.

**Q21: **

Find the wavelength of light that produces a third-order minimum at when passing through a slit with a width of 6.000 μm.

**Q22: **

Light passing through a single slit produces a second-order minimum at an angle of .

At what angle is the third-order minimum produced?

At what angle is the first-order minimum produced?

**Q23: **

Light of wavelength 450 nm passes through a slit of width 0.32 mm.

What is the angular position of the second-order minimum in the diffraction pattern produced?

What is the angular width of the central peak of the diffraction pattern?

- A ,
- B ,
- C ,
- D ,
- E ,

**Q24: **

Red light of wavelength 630 nm in air from a helium-neon laser is incident on a single slit of width 0.0400 mm. The entire apparatus is immersed in water of refractive index 1.33. Determine the angular width of the central peak.

**Q25: **

630 nm wavelength light falls onto a slit of width 25.3 μm.

Find the angle of the second-order diffraction minimum produced.

What slit width would produce a second-order diffraction minimum angle of ?