Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.
A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 m s–1.
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.
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