Coherent monochromatic light of wavelength λ emerges from the slits X and Y to form dark
fringes at P, Q, R and S in a double slit apparatus. Which one of the following statements is true?
A When the distance D is increased, the separation of the fringes increases.
B When the distance between X and Y is increased, the separation of the fringes increases.
C When the width of the slit T is decreased, the separation of the fringes decreases.
D There is a dark fringe at P because (YP − XP) is 2λ .
(Total 1 mark)
The diagram represents the experimental arrangement used to produce interference fringes in
2 Young’s double slit experiment.
The spacing of the fringes on the screen will increase if
A the width of the single slit is increased
B the distance XY between the two slits is increased
C a light source of lower frequency is used
D the distance between the single and double slits is decreased
(Total 1 mark)
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Young’s two slit interference pattern with red light of wavelength 7.0 × 10 –7 m gives a fringe
3
separation of 2.0 mm.
What separation, in mm, would be observed at the same place using blue light of wavelength
45 × 10–7 m?
A 0.65
B 1.3
C 2.6
D 3.1
(Total 1 mark)
Interference maxima produced by a double source are observed at a distance of 1.0 m from the
4 sources. In which one of the following cases are the maxima closest together?
A red light of wavelength 700 nm from sources 4.0 mm apart
B sound waves of wavelength 20 mm from sources 50 mm apart
C blue light of wavelength 450 nm from sources 2.0 mm apart
D surface water waves of wavelength 10 mm from sources 200 mm apart
(Total 1 mark)
In a double slit interference arrangement the fringe spacing is w when the wavelength of the
5
radiation is λ, the distance between the double slits is s and the distance between the slits and
the plane of the observed fringes is D. In which one of the following cases would the fringe
spacing also be w?
wave length distance between distance between
slits slits and fringes
A 2λ 2s 2D
B 2λ 4s 2D
C 2λ 2s 4D
D 4λ 2s 2D
(Total 1 mark)
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Interference fringes, produced by monochromatic light, are viewed on a screen placed a distance
6
D from a double slit system with slit separation s. The distance between the centres of two
adjacent fringes (the fringe separation) is w. If both s and D are doubled, what will be the new
fringe separation?
A
B w
C 2w
D 4w
(Total 1 mark)
The diagram shows a microwave transmitter T which directs microwaves of wavelength eat two
7 slits S1 and S2 formed by metal plates. The microwaves that pass through the two slits are
detected by a receiver.
receiver
at O
When the receiver is moved to P from O, which is equidistant from S1 and S2, the signal received
decreases from a maximum to a minimum. Which one of the following statements is a correct
deduction from this observation?
A The path difference S1O – S2O = 0.5 λ
B The path difference S1O – S2O = λ
C The path difference S1P – S2P = 0.5 λ
D The path difference S1P – S2P = λ
(Total 1 mark)
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