Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?
Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a dark room?
Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.
An echo is heard in 3 s. What is
the distance of the reflecting
surface from the source, given that
the speed of sound is 342 m s–1?
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