The speed of sound in air is 320ms-1 and in water it is 1600ms-1, it takes 2.5s for sound to reach a certain distance from the source placed in air ,how much time will it take for sound to travel the same distance when the source is in water
Answers
What is sound and how is it produced?
Answer:
Sound is a form of energy which is produced by vibration of objects. Vibrations are rapid to and fro motion of an object.
When a body vibrates, a disturbance is created in the medium by the particles.
This disturbance travels in the form of waves. This produces sound.
Physics Class 9 Sound Sound Wave 1
Question2.
Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.
Answer:
Compressions and rarefactions are produced because of the disturbance in medium caused by sound wave.
Sound waves propagate because of compressions and rarefactions of the particles of the medium.
Compressions are the regions of high pressure (high density of the particles).
Rarefactions are the regions of low pressure (low density of the particles).
When an object starts vibrating it creates disturbance in the medium.
Because of the disturbance of the particles of medium, they come closer to each other as compare to their normal position.
On the other hand adjacent particles go farther to each other. Both happen simultaneously.
The region where particles come closer to each other is called compressions and region where particles go farther from each other are called rarefactions.
Physics Class 9 Sound Compressions & Rarefactions