Test: Sound - 1

The number of vibration per second is called frequency. The pitch of sound depends upon frequency of sound.

The vocal cords in men are about 20mm long. In Women these are about 5mm shorter.

Sound is produced by vibration of object. Vibration creates disturbance in medium which reaches to observer ear through air, water or solid medium.

The range of audible frequencies for human ear is 20Hz to 20,000Hz.

When a tightly stretched band is plucked it vibrate and produce sound due to disturbance in medium.

Speed of sound depends upon nature of medium, temperature, humidity and source of sound but nature of medium influence the speed of sound most. Sound travels faster in solid medium than air and water.

1Hz= 1 vibration/second

1 minute=60 seconds
Hence, 1 hertz = 60 vibrations /minute

The vibrations of object are not visible because in most of the cases amplitude of waves are very small. Amplitude is the maximum displacement from mean position.

Loudness is directly proportional to the amplitude of sound waves. If the amplitude is high then sound will be louder and the sound will be feeble if the amplitude is low.

Sound is produced by vibration of body. In flute, the vibrating part is air column inside the flute.