a) b) Explain the principle of superposition of waves. Two light waves being used to show interference effects, meet at a point and this results in destructive interference. i. Explain the conditions necessary for the two waves meeting at a point to cause complete destructive interference. ii. In practice, the two light waves will have come from a single source of light. Why is this necessary?
a) b) Explain the principle of superposition of waves. Two light waves being used to show interference effects, meet at a point and this results in destructive interference. i. Explain the conditions necessary for the two waves meeting at a point to cause complete destructive interference. ii. In practice, the two light waves will have come from a single source of light. Why is this necessary?
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Transcribed Image Text:a)
Explain the principle of superposition of waves.
b) Two light waves being used to show interference effects, meet at a point
and this results in destructive interference.
i.
ii.
i.
Explain the conditions necessary for the two waves meeting at a
point to cause complete destructive interference.
c)
In a Young's double slit experiment, light of frequency 4.85 x 10¹4 Hz
passes through a narrow single slit and is then incident on two very
narrow, closely spaced, parallel slits. A screen is placed 1.60 m from the
double slit arrangement and bright interference fringes are visible on the
screen. The distance across 20 fringe spacings is 90.5 mm.
Determine the spacing of the double slits.
If the distance between the double slits and screen is reduced to
1.15 m, determine the spacing between adjacent dark fringes.
ii.
In practice, the two light waves will have come from a single source
of light. Why is this necessary?
iii. If the monochromatic light source is replaced by an intense white
light source, describe the appearance of the bright fringes closest to
the centre of the screen.
Transcribed Image Text:d) Two loud speakers are connected to the same frequency source and are
positioned facing each other on the opposite sides of a large room. They
are each emitting a sound wave of frequency 180 Hz.
A small microphone is connected to some headphones and is held
between the speakers. As the microphone is moved in a straight line
between the speakers a gradual rise and fall in intensity is heard on the
headphones.
Explain why the intensity will rise and fall.
If the distance between the loudest sounds is 0.90 m, determine the
wavelength of the sound waves.
iii. Determine the velocity of sound from these results.
i.
ii.
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