A bat detects the location of a moth by using echo location. If the moth is foolishly flying towards the bat, the frequency of the reflected sound the bat hears
A. is higher.
B. is lower.
C. is the same.
A. is higher.
You might also like to view...
If a star has a mass of 10 solar masses and a luminosity of 10,000 solar luminosities, how long is its lifetime? (The Sun's lifetime is 10 billion years.)
A) 100 billion years B) 10 million years C) 1 million years D) 100 trillion years
A wheel accelerates with a constant angular acceleration of 4.5 rad/s2 from an initial angular speed of 1.0 rad/s. (a) Through what angle does the wheel turn in the first 2.0 s, and (b) what is its angular speed at that time?
What will be an ideal response?
The intensity level of sound 30 m from a jet airliner is 120 dB. At what distance from the airplane will the sound intensity level be a tolerable 100 dB? (Assume spherical spreading of sound.)
a. 60 m c. 300 m b. 90 m d. 400 m
A 2.0-?F capacitor is charged to 12 V and then discharged through a 4.0 × 106 ? resistor. How long will it take for the voltage across the capacitor to drop to 3.0 V?
A) 4.5 s B) 8.0 s C) 11 s D) 22 s E) 24 s