Physics
To detect the obstacles in their path, bats produce:
- Infrasonic waves
- Ultrasonic waves
- Electromagnetic waves
- Radio waves.
Sound
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Answer
Ultrasonic waves
Reason — Bats can produce and detect the sound waves of very high frequency up to about 100 kHz. The audible sound range is from 20 Hz to 20 kHz. Any frequency above 20 kHz is called ultrasonic waves. Hence, we can say that bats produce ultrasonic waves.
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Related Questions
Time taken to hear the echo if distance between the listener and the obstacle d is given by :
t = d x V
t = 2d x V
t =
t =
The minimum distance between the source and the reflector in air, to hear an echo, is approximately:
- 10 m
- 17 m
- 34 m
- 50 m.
With respect to ultrasonic waves, which of the following statements is incorrect ?
- they travel undeviated through a long distance
- they have a speed greater than the speed of sound in a medium
- they are not easily absorbed in a medium
- they can be confined to a narrow beam
Infrasonic sound waves have a frequency :
- between 20 Hz to 10,000 Hz
- below 20 Hz
- above 20,000 Hz
- between 20 Hz to 20,000 Hz