The diagram shows two sinusoidal waveforms. At time t = 0 the waves are in phase. At the dotted line, t = 18 s.
At which time is the phase difference between the two oscillations ⅛ of a cycle?
A 4.0 s
B 4.5 s
C 8.0 s
D 9.0 s
A signal has a frequency of 2.0 MHz.
What is the period of the signal?
A 2 µs
B 5 µs
C 200 ns
D 500 ns
A displacement-time graph for a transverse wave is shown in the diagram. The phase difference between X and Y can be expressed as nπ. What is the value of n?
A 1.5
B 2.5
C 3.0
D 6.0
The frequency of a certain wave is 500 Hz and its speed is 340 ms^–1.
What is the phase difference between the motions of two points on the wave 0.17 m apart?
A π/4 rad
B π/2 rad
C 3π/4 rad
D π rad
Noise reduction headphones actively produce their own sound waves in order to cancel out external sound waves.
A microphone in the headphones receives waves of one frequency. A loudspeaker in the headphones then produces a wave of that frequency but of a different phase.
What is the phase difference between the external sound wave and the wave produced by the loudspeaker in the headphones?
A 90°
B 180°
C 270°
D 360°
The diagram shows a standing wave on a string. The standing wave has three nodes N1, N2 and N3.
Which statement is correct?
A All points on the string vibrate in phase.
B All points on the string vibrate with the same amplitude.
C Points equidistant from N2 vibrate with the same frequency and in phase.
D Points equidistant from N2 vibrate with the same frequency and the same amplitude.
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