Question

what is -audible and inaudible sound,mass and weight,vibration.

Answer 1

1. There is a range of sound that a human ear can detect. It is 20-20,000 Hz.

Audible Sound : The sound produced in the above range is audible.
Inaudible Sound : The sound produced outside the above range is inaudible.

2. Mass of substance is the actual force exerted by the body due to its composition.
Weight is the pressure is exerted by the body on the surface under the influence of gravitational pull. Thus is is mass multiplied by acceleration due to gravity.

3. Vibration: The to and fro movement of substance taking at one place is called vibration.