Sound waves and resonance

Question 1 of 10

Explain resonance with two everyday examples, and describe one situation where resonance is harmful.

Question 2 of 10

Two tuning forks of 256 Hz and 259 Hz are sounded together. What is the beat frequency?

Question 3 of 10

The echo from a wall returns after 2 s. If sound travels at 340 m/s, the wall is ___ m away.

Question 4 of 10

Resonance occurs when

Question 5 of 10

Sound waves can be polarised.

Question 6 of 10

A tuning fork of frequency 256 Hz gives the first resonance in a closed tube. Taking v = 340 m/s and neglecting end correction, find the length of the air column.

Question 7 of 10

A boy hears the echo of his shout from a cliff 495 m away. If sound travels at 330 m/s, how long after shouting does he hear the echo?

Question 8 of 10

The echo from a wall returns after 6 s. If sound travels at 340 m/s, the wall is ___ m away.

Question 9 of 10

With the aid of diagrams, show the first three modes of vibration of a stretched string fixed at both ends, and give the relation between the frequencies.

Question 10 of 10

Beats are heard when