Question

FILL IN THE BLANKS :

1. Vibration means ________ motion of a object.

2. The repetition of sound produced due to the refraction of the sound waves from a reflecting surface is known as an ________.​

Answer 1

Answer:

1. to and fro

2. echo

Hope my answers will be able to help you out.

Answer 2

Answer:

1.oscilleration

2.echo.