Which of the following statement best describes frequency?

A. the maximum disturbance caused by a wave

B. the number of complete vibrations per second

C. the distance between one crest of a wave and the next one

D. the distance travelled by a wave per second

Explain the terms ‘crests’ and ‘troughs’ of a wave? What type of waves consist of crests and troughs?

The flash of a gun is seen by a man 3 seconds before the sound is heard. Calculate the distance of the gun from the man (Speed of sound in air is 332 m/s).

Which of the following vibrates when a musical note is produced by the cymbals in an orchestra?

A. stretched strings

B. stretched membranes

C. metal plates

D. air columns

If the speed of a wave is 340 m/s and its frequency is 1700 Hz, then l for this wave in cm will be:

A. 2 B. 0.2

C. 20 D. 200