Question
Graph 1 shows the variation with time of displacement at a fixed distance along a progressive wave.
Graph 2 represents the same wave and shows the variation with distance of displacement at an instant in time.
What is the speed of the wave?
(A) 5.0cm$s^{-1}$
(B) 48cm$s^{-1}$
(C) 150cm$s^{-1}$
(D) 300cm$s^{-1}$
Answer/Explanation
Ans: D
Question
A progressive wave of frequency 1.5 kHz travels in a medium at a speed of 340 m $s^{-1}$.
What is the minimum distance between two points on the wave that have a phase difference of 70$\circ$ ?
(A) 4.4 cm
(B) 8.8 cm
(C) 18 cm
(D) 23 cm
Answer/Explanation
Ans: A
Question
A microphone detects a sound wave. The microphone is connected to a cathode-ray oscilloscope (CRO).
The shape of the trace on the screen of the CRO is shown.
▶️Answer/Explanation
Ans: B
Question
The graph shows the variation with time of the displacement of a particle in a progressive wave.
Two measurements, x and y, are labelled on the graph. What do x and y represent?
▶️Answer/Explanation
Ans: A