Question

Fill in the blanks.
1. Time period is equal to the reciprocal of
2. The maximum displacement of a vibrating body from its mean position is called
3. Sound cannot travel through
4. Sound travels slowest in
5. Sound travels about
times faster in iron than in air.​

Answer 1

1. frequency

2. amplitude

3. vaccum

4. gases

5. 17 times..

hope it helps