Exam code: 8PH0
The diagram represents an arrangement used to generate standing waves on a string.
A standing wave pattern with two nodes is obtained as shown.
Which of the following single changes could produce a standing wave pattern with three nodes?
decreasing the distance between the vibration generator and pulley
decreasing the frequency of the vibration generator
decreasing the mass on the mass hanger
decreasing the mass per unit length of the string
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Interference fringes are produced when light from two sources overlaps.
Which condition must the two sources satisfy to produce an observable interference pattern?
They must emit light with a constant phase difference
They must emit light of the same frequency
They must emit light of the same amplitude
They must emit light of the same wavelength and amplitude
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The distance between two points on a progressive wave is , where is the wavelength of the wave.
What is the phase difference, in radians, between the oscillations at the two points?
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