1.

A vertical tube is made to stand in water so that the water level can be adjusted. Sound wave of frequency `320Hz` are sent into the top of the tube. If standing waves are produced at two successive water levels of `20 cm` and `73 cm`, what is the speed of sound waves in the air in the tube (in `m//s`)A. `339`B. `332`C. `334`D. `336`

Answer» Correct Answer - A
Frequency `n=320 Hz`
Length of water level `l=20cm`
Second length of water level `l_(2)=73 cm`
Velocity of sound in air `V=2n(l_(2)-l_(1))`
`V=2xx320(73-20)`, `V=339m//s`.


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