Q37 of 199 Page 206

Fill in the following blanks with suitable words:

(a) An echo is simply a ………. Sound.


(b) Pitch od sound depends on ………


(c) Loudness of sound depends on ……….


(d) Quality of sound depends on ……….


(e) Echoes are caused by the …………of sound.

(a) An echo is simply a reflected Sound.

(b) Pitch od sound depends on frequency.


(c) Loudness of sound depends on amplitude.


(d) Quality of sound depends on waveform.


(e) Echoes are caused by the reflection of sound.


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What happens to the loudness of a sound if its amplitude decreases?

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What name is given to sound waves of frequencies higher than 20 kHz?

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On which day, a hot day or a cold day, an echo is heard sooner? (Give reason for your answer.

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In which medium, air or water, an echo is heard much sooner? Why?