Why sound needs medium for propagation? A particle oscillates 40 times in one minute what will be its time period of oscillations.
plz say me the answer
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Explanation:

Sound needs a material medium for their propagation like solid, liquid or gas to travel because the molecules of solid, liquid and gases carry sound waves from one point to another. Sound cannot progress through the vacuum because the vacuum has no molecules which can vibrate and carry the sound waves.

Frequency= no. of oscillations/time=40/60sec

4/6=0.66

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

the body's situation won't change the forces are equal opposit and on the same body