A bat flies at a steady speed of 4 ~ms ⁻¹ emitting a sound of f =90 10³ ~Hz . It is flying horizontally towards a vertical wall. The frequency of the reflected sound as detected by the bat will be (take velocity of sound in air is 330 ~ms ⁻

Question

A bat flies at a steady speed of 4 ~ms ⁻¹ emitting a sound of f =90 10³ ~Hz . It is flying horizontally towards a vertical wall. The frequency of the reflected sound as detected by the bat will be (take velocity of sound in air is 330 ~ms ⁻¹ )

Quantrex Academy · Accepted Answer

Correct answer: C. 92.1 10³ ~Hz

Frequency of reflected sound heard by the bat aligned v^ &=v [ v- (v₀ ) v-v_ s ] &=v [ v+v₀ v-v_ s ]=v [ v+v_ b v-v_ b ] aligned aligned &=v [ 330+4 330-4 ] 90 10³ &=92.1 10³ ~Hz aligned

A bat flies at a steady speed of 4 ~ms ⁻¹ emitting a sound of f =90 10³ ~Hz . It is flying horizontally towards a vertical wall. The frequency of the reflected sound as detected by the bat will be (take velocity of sound in air is 330 ~ms ⁻¹ )

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