Question

1. To increase the loudness of the sound by 16 times, by how much should be the amplitude of vibration be changed? 2. Give an example to show that light travels faster than sound. 3. What factors decide the frequency of vibration of a plucked string? 4. If you hear a firecracker 2 seconds after it is fired, how far away from it are you? (Assume the speed of the sound in air is 330 m/s).

Answer 1

Answer:

1.To increase the 'loudness of the sound' by four times, the amplitude should be increased to the 'square of amplitude'. A sound is produced by vibrating a body. The 'loudness of the sound' produced depends upon the 'amplitude of the vibrations' made by the vibrating body.

2. Lightning.

3. The four properties of the string that affect its frequency are length, diameter, tension, and density. These properties are described below: When the length of a string is changed, it will vibrate with a different frequency. Shorter strings have higher frequency and therefore higher pitch.