Waves MCQs (set 2) more wave characteristics

Which of the statements below correctly describe any two points on a wavefront?

• They are moving perpendicularly to the ray

• They have the same phase

• They have the same amplitude

• They have the same displacement

A cathode-ray oscilloscope (C.R.O.) is used to display the trace from a sound wave. The time-base is set at 5 µs·m⁻¹. What is the frequency of the sound wave?

• 6.7 Hz

• 67 Hz

• 6.7 kHz

• 67 kHz

A wave of frequency 15 Hz travels at 24 m·s⁻¹ through a medium. What is the phase difference between two points 2.0 m apart?

• There is no phase difference.

• They are out of phase by a quarter of a cycle.

• They are out of phase by half a cycle.

• They are out of phase by 0.8 of a cycle.

A wave has a frequency of 5.0 GHz. What is the period of the wave?

• 200 ps

• 2.0 ns

• 20 ns

• 20 000 µs

What are the period, the frequency, and the amplitude of the wave represented by the graph?(Give your answer to two significant figures)

• A) Period: 0.0027 s, Frequency: 370 Hz, Amplitude: 0.0067 m

• B) Period: 0.0031 s, Frequency: 320 Hz, Amplitude: 0.013 m

• C) Period: 0.0035 s, Frequency: 290 Hz, Amplitude: 0.0067 m

• D) Period: 0.0042 s, Frequency: 240 Hz, Amplitude: 0.013 m

X and Y are two points on the surface of water in a ripple tank. A source of waves of constant frequency begins to generate waves, which then travel past X and Y, causing them to oscillate. What is the phase difference Δϕ between X and Y?

A wave pulse moves along a stretched rope in the direction shown. Which diagram correctly shows the variation with time t of the displacement s of the P in the rope?

• 
• 
• 
• 

• f² against λ

• f against λ²

• f versus 1/λ

• f² versus 1/λ

When the liquid crystal display of a calculator is observed through a polarising film, the display changes as the film is rotated. Which property describes the radiation from the calculator display?

• unpolarised

• a longitudinal wave

• a transverse wave

• a wave with a 3 cm wavelength

A surveyor's device emits and detects laser pulses. What is the time delay between emission and detection of a pulse that is reflected from a wall 150 m away?

• 0.050 ns

• 0.10 ns

• 0.50 µs

• 1.0 µs