How can we recognize a person just by hearing her voice without seeing her face?
Bats catch their prey in the dark even when they don't see the prey. How can this happen?
If the pressure amplitude of a sound wave is halved, by what factor does the intensity of the wave change?
Whistle of an approaching train is shifter, why?
Explain the diffrence in characteristics between ultrasonic and supersonic sound waves.
Why is the voice of women more sharp or intelligible than that of a man?
What is the threshold of human hearing? Define one bel.
Sound waves are also called the pressure waves. Why?
An empty vessel sounds more than a filled one when it is struck. Why?
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