Advertisements
Advertisements
Question
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
Solution
The impression of sound lasts on the eardrum for `1/10` of a second. In `1/10` of a second, the sound travels a distance `332"m"/"s"xx1/10"s"` = 33.2. Thus, the minimum distance between the source of the sound and the reflecting body should be `33.2/2` = 16.6 m.
As the distance 10 m is far less than 16.6 m, therefore the ear cannot make out when the original sound had died and echo has been received. Thus, no echo is heard.
APPEARS IN
RELATED QUESTIONS
A wire of length 80 cm has a frequency of 256 Hz. Calculate the length of a similar wire under similar tension, which will have frequency 1024 Hz
Define amplitude term in relation to a wave.
A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which changes.
Name the principle on which a soundboard works.
Write the approximate value of the speed of sound in water.
What is meant by echo depth sounding?
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
Name the type of waves that are used for sound ranging. Why are radio waves not audible to us?
What is mean by the reflection of sound?
