A bat emitting an ultrasonic wave of frequency 4.5 × 10 4 Hz flies at a speed of 6 m/s between two parallel walls. Find the two frequencies heard by the bat and the beat frequency between the two. The speed of sound is 330 m/s.
Text Solution
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Given:
Speed of bat 
Frequency of ultrasonic wave 
Velocity of bird 
Let us assume that the bat is flying between the walls X and Y.
Apparent frequency received by the wall Y is
Now, the apparent frequency received by the bat after reflection from the wall Y is given by:
Frequency of ultrasonic wave received by wall X:
The frequency of the ultrasonic wave received by the bat after reflection from the wall X is
Beat frequency heard by the bat is
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