 # Waves - Multiple Choice Questions Q1. Two points on a progressive wave are one-eighth of a wavelength apart.

The distance between them is 0.5 m, and the frequency of the oscillation is 10 Hz.

What is the minimum speed of the wave?

 A 0.2 m s−1 B 10 m s−1 C 20 m s−1 D 40 m s−1

Q2. Which of the following waves cannot be polarised?

 A radio B ultrasonic C microwave D ultraviolet

Q3. Which of the following is correct for a stationary wave?

 A Between two nodes the amplitude of the wave is constant. B The two waves producing the stationary wave must always be 180° out of phase. C The separation of the nodes for the second harmonic is double the separation of nodes for the first harmonic. D Between two nodes all parts of the wave vibrate in phase.

Q4. Sound waves cross a boundary between two media X and Y.

The frequency of the waves in X is 400Hz.

The speed of the waves in X is 330 ms −1 and the speed of the waves in Y is 1320 ms –1 .

What are the correct frequency and wavelength in Y?

 Frequency / Hz Wavelength / m A 100 0.82 B 400 0.82 C 400 3.3 D 1600 3.3 