1.

A source of sound producing wavelength 50 cm is moving away from a stationay observer with ((1)/(5) )^(th) speed of sound. Then what is the wavelength of sound received by the observer?

Answer»

55 CM
40 cm
60 cm
80 cm

SOLUTION :Here , wavelength of the SOURCE , `lambda` = 50 cm
Speed of the sound = v
speed of the source , `v_(s) = (1)/(5) ` V
As the source is moving away from the stationary OBSERVER, therefore the wavelength of sound received of sound received by the observer is
`lambda. = ((v + v_(s))/(v)) lambda= ((V + (1)/(5) v))/(v)lambda`
` = (6)/(5) lambda = (6)/(5) xx 50 ` cm = 60 cm .
correct choice is c.


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