Question

Exercise B
State whether the following statements are True or False. Correct the false statements:-

1. As the sound waves propagates, the particles of the medium only vibrate about their mean position but do not leave their position.
2. Sound propagates only in front direction of the source.
3. The pitch of a sound determines its shrillness or flatness.
4. Tight strings produce flat sounds.
5. The frequency of buzzing mosquito is lesser than the roaring of a lion.
6. The quality of sound produced by any two instruments can be same or different.​

Answer 1

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• True

• False

• True

• True

• True

• True

Answer 2

Answer:

1. True

2. False

3. True

4. False

5. False

6.False

Explanation:

1.sound wave only vibrates Only in mean position.

2. sound from a source move in all directions. (pg no. 129)

3.Pitch is that characteristics of sound which differentiate a shrill sound from a flat sound(pg no. 134)

4. sound of higher pitch can be obtained by vibration of tight and thin string whereas lower pitch from thicker with reduced tightness. (pg no. 134)

5. the quality of sound produced by any two instruments will always differ.(pg no. 136)