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14 Nov 2019
Suppose a bat tries to locate a moth by emitting sound pulses and detecting the echo. Assume that the ultrasound frequency is 10MHz and that the velocity in air is 340m/s. If the echo returns after 0.25s, how far away is the moth? The frequency of the returning echo is 10.25MHz. What is the velocity of the moth, and is it moving away from or towards the bat? The bat moves toward the moth with a velocity of 5 m/s and keeps emitting echo pulses. What is the frequency of the sound pulses as detected by a stationary observer on the ground? What is the frequency of the sound pulses as detected by the moth?
Suppose a bat tries to locate a moth by emitting sound pulses and detecting the echo. Assume that the ultrasound frequency is 10MHz and that the velocity in air is 340m/s. If the echo returns after 0.25s, how far away is the moth? The frequency of the returning echo is 10.25MHz. What is the velocity of the moth, and is it moving away from or towards the bat? The bat moves toward the moth with a velocity of 5 m/s and keeps emitting echo pulses. What is the frequency of the sound pulses as detected by a stationary observer on the ground? What is the frequency of the sound pulses as detected by the moth?