Physics
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 =
Sound
23 Likes
Answer
t =
Reason — For an echo to be heard, sound must travel from the listener to the obstacle and then back to the listener, covering a total distance of . If is the speed of sound, then the time taken is:
Answered By
13 Likes
Related Questions
The condition for reflection of sound wave is :
- surface must be smooth
- surface must be polished
- reflecting surface must be bigger than the wavelength of the sound wave
- reflecting surface must be smaller than the wavelength of the sound wave
For an echo, the reflected sound must reach the person at least …………… after the original sound is heard.
- 1 s
- 10 s
- 0.1 s
- 0.01 s
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.
To detect the obstacles in their path, bats produce:
- Infrasonic waves
- Ultrasonic waves
- Electromagnetic waves
- Radio waves.