Q56 of 123 Page 254

State one observation from everyday life which shows that sound travels much more slower than light.

In case of thunder, we see the lightening first and then the sound of thunder. This is because, the velocity of light in air is while the velocity of sound in air is 343 m/s.


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54

Why are the voices of men, women and children different ?

 55

If you want to hear a train approaching from far away, why is it more convenient to put the ear to the track?

 57

Explain why, the flash of lightning is seen first but the sound of thunder is heard a little later (though lightning and thunder take place in the sky at the same time and same distance from us).

 58

Name the object (or part) which vibrates to produce sound in the following musical instruments :

(a) Sitar


(b) Dholak


(c) Flute


(d)Cymbals


(e) Veena


(f) Tabla