Sound

Sound Worksheet-10

21. Human ear cannot hear sound waves of frequency above____.

22. Sound waves of frequencies below 20 Hz are called ____.

23. Sound waves of frequencies above 20,000 Hz are called____.

24. In wind instrument sound is produced by vibrating ______ inside the instrument.

25. In percussion instrument sound is produced by vibrating_____.

26. Unpleasant, discomfort-causing sound from any source is called _____.

Sound Worksheet-11

1. Rapid back and forth movement of the body about its central position

A. Amplitude                                 B. Vibration

C. Frequency                                 D. Time period

2. The maximum displacement of the object from the mean position during oscillation

A. Amplitude                                 B. Vibration

Sound Worksheet-12

1. The frequency of a given sound is 1.5k Hz. How many vibrations is it completing in one second?

2. Which part of the human body is responsible for producing sound?

3. What is the length of vocal cords in men?

4. Can sound travel in vacuum?

5. What is meant by oscillatory motion?

6. Give the unit in which frequency is measured.