Sound

1 Sound waves consist of areas of high pressure called ______ and areas of low pressure called ______.

2 Which of these can not travel in a vacuum?

3 Through which of these does sound travel the fastest?

4 Sounds with a high frequency have a high ______.

5 What units are used to measure the frequency of a sound wave?

6 The frequency range human beings can hear is ______.

7 Using sound waves to locate a submarine is called _______.

8 What happens to the pitch of a string as the string gets longer?

9 Vibrations per second refers to a wave’s ______.

10 When two waves meet in the same place and result in a bigger wave it is called__

11 A sound seems to get higher pitched as the source approaches you and lower pitched as it moves away from you. This is called _____.

12 Another name for a compressional wave is a ______ wave.

13 When impulses are applied to a vibrating object in rhythm with its natural frequency we get _____.

14 How does the speed of light compare with the speed of sound?

15 A echo is caused by sound _______.