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A bat files at speed of 4m/s, emitting a sound of f = 90\times 10^{3}H_{z}. It is flying horizontally towards a vertical wall. The frequency of the reflected sound as detected by the bat will be

Option: 1

88.1\times 10^{3}H_{z}


Option: 2

87.1\times 10^{3}H_{z}


Option: 3

92.1\times 10^{3}H_{z}


Option: 4

89.1\times 10^{3}H_{z}


Answers (1)

best_answer

Frequency of reflected sound heart by the bat, 

{V }'=V\left[\frac{v-(v_0)}{v-v_s}\right]

       =V\left[\frac{v+(v_0)}{v-v_s}\right]

       =V\left[\frac{v+(v_b)}{v-v_b}\right]

       =V\left[\frac{330+4}{330-4}\right]\times 90\times10^{3}H_z

       =92.1\times10^{3}H_z

Posted by

Irshad Anwar

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