Question

1. Loudness of sound depend on …………….

2. Sound absorbing materials are required in auditoria to avoid ……………

3. The property of sound that is used by animals to find their way and locate their food is ………..

4. The two kinds of sounds we cannot hear are ……………. and ………….

5. ……………… of any kind is the principal source of production of sound.

6. …………… instrument used in the laboratory to produce sound of a fixed frequency.

7. Sound needs a …………….. medium for propagation.

8. The vibrations of a simple pendulum are also known as ……………….

9. A soft board will………………… most of the sound falling on it.

10.The number of vibrations completed in one second is known as ………….

11.……………. Is proportional to the square of amplitude.

12.If the thickness of the vibrating string is increased its pitch ………………

13. Speed of sound highest in …………… medium.

14.The range of audible frequency for the human ear is……………

15.Noise is produced by……………..​

Answer 1

Answer:

1. amplitude

2.avoid Noise Pollution

3.The sound is called Echolocation.

4.infrasonic and ultrasonic.

5.vibrates

6.Tuning fork

A tuning fork is the instrument used to produce sound of a fixed frequency because it is not a moving instrument .

7. molecules of solids, liquids, and gases

molecules of solids, liquids, and gases convey sound waves from one point to another, sound requires a material medium such as solid, liquid, or gas to move. ... Because there are no molecules in the vacuum that can vibrate and convey sound waves, sound cannot travel through it.

8.The vibrations of a simple pendulum are also known as "oscillation".

9. A soft board will "absorb most" of the sound falling on it

10. The number of vibrations completed in one second is known as "frequency".

11. Loudness of sound

Loudness of sound is directly proportional to the square of the amplitude. When amplitude is doubled, loudness becomes 4 times.

12. pitch decrease

13. maximum

The speed of sound is the distance that any sound travels per unit of time.

The molecules in the medium are tightly packed when the medium is dense, that implies the sound travels faster.

Therefore, as the medium density increases, the speed of sound increases.

14. 20 Hz to 20 kHz.

Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz

15. Irregular and non-periodic vibration

Smooth and periodic vibration is music and irregular and non-periodic vibration is noise.