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Give reasons for below points : (a) Wh...

Give reasons for below points :
(a) Why do singers regularly perform breathing exercises to increase their lung capacity ?
(b) Why can we not hear the sound produced by a dog whistle ?
(c) Bats cannot see any better in the dark than they can see in light. How, then, are bats able to fly easily in extremely dark places ?

Text Solution

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(a) Breathing exercises increase the lung capacity and a good lung capacity allows singers to take in a large amount of air, to expel for a complex line of singing during music recording.
(b) A dog whistle emits a sound of ultarasonic range
(above 20000 Hz) which is an inaudible sound for human beings.
(c) Bats produce ultrasonic waves through their mouth and nose.When these waves hit an obstacle, they produce echoes Using
these echoes, bats fly easily in the dark and find their food as well.
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