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Q.

Speed of sound in water is $1450 m s^{- 1}$ .The minimum wave length and maximum wave length of sound in water for audible range of an average human ear respectively are;

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a

72.5mm,72.5m

b

72.5cm , 72.5m

c

7.25mm,7.25m

d

7.25mm,72.5m

answer is C.

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Detailed Solution

$λ_{\min} = \frac{v}{f_{\max}} = \frac{1450}{20000} = 72.5 m m λ_{\max} = \frac{v}{f_{\min}} = \frac{1450}{20} = 72.5 m$

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