Properties of Waves
4 marks · NormalThe graph below shows the displacement of a point on a string as a wave passes along it.
What is the amplitude of the wave shown on the graph?
Determine the time period of the wave.
Calculate the frequency of the wave.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) 10 mm · must show correct reading of amplitude
(b) 0.04 s · must show period from two identical points
(c) 25 Hz · must show f=1/T, frequency calculation
Common mistakes: Halving the amplitude; Incorrectly reading the period
Show mark scheme and worked solution
Marking points
A1 (a) · 1 mark · States amplitude is 10 mm.
A2 (b) · 1 mark · States period is 0.04 s.
M1 (c) · 1 mark · Uses f = 1/T formula.
A3 (c) · 1 mark · Correct frequency (25 Hz). (follow-through)
Worked solution
a) The amplitude is the maximum displacement from zero, which is 10 mm.
b) The time for one complete cycle (from 0 to 0) is 0.04 s.