The graph shows the variation of the displacement with distance for a progressive wave at one instant in time. The period of the wave is 91 ms . What can be determined about the wave?
A.
It has a velocity of \(0.44 \mathrm{~m} \mathrm{~s}^{-1}\) and a frequency of 11 Hz .
B.
It has a velocity of \(0.55 \mathrm{~m} \mathrm{~s}^{-1}\) and a wavelength of 5.0 cm .
C.
It is longitudinal and has a frequency of 11 Hz .
D.
It is transverse and has a wavelength of 4.0 cm .
Exam No：9702_w24_qp_11 Year：2024 Question No：24
Answer:
A
Knowledge points:
7.1.1 describe what is meant by wave motion as illustrated by vibration in ropes, springs and ripple tanks
7.1.2 understand and use the terms displacement, amplitude, phase difference, period, frequency, wavelength and speed
7.1.3 deduce, from the definitions of speed, frequency and wavelength, the wave equation v = fm d) recall and use the equation v = fm
7.1.4 recall and use the equation v = fm
7.1.5 recall and use the relationship intensity ∝ (amplitude)2
Solution:
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