Q46 of 123 Page 253

Why do we not hear the screams of a bat ?

We cannot hear the screams of a bat because its frequency is higher than 20,000Hz.


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44

Write the full form of dB.

 45

What is the name of very high frequency sounds which cannot be heard by the human ear?

 47

Which of the following frequency of sound can be heard by a dog but not by a man?

(a) 50,000 hertz


(b) 15,000 hertz.

 48

Name the substance which vibrates in a flute to produce sound.