Advertisements
Advertisements
Question
The speed of sound in water is 1500 metres per second. How far away from an under-sea rock should a deep sea diver be so that he can hear his own echo ?
Advertisements
Solution
We have to calculate the depth in water.
Given: Time taken to hear the echo t = 0.1 s
So time taken for sound to reach the reflecting surface
`(t_r) = 0.1/2` s
= `1/20` s
Speed of sound in water ν = 1,500 m/s
Therefore, distance of reflecting surface from the observer is
= `(v) xx (t_r)`
= `(1500) xx (1/20)` m
= 75 m
APPEARS IN
RELATED QUESTIONS
An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s−1?
Does sound follow the same laws of reflection as light does? Explain.
Which property of sound leads of the formation of echoes ?
Fill in the blank with suitable word :
An echo is simply a ................... sound.
Fill in the blank with suitable word :
Echoes are caused by the ...................... of sound.
Why are the ceilings of concert halls made curved ? Draw a labelled diagram to illustrate your answer.
The echo of a sound is heard after 5 seconds. If the speed of sound in air be 342 m/s, calculate the distance of the reflecting surface.
A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a bare room
What is an echo?
Answer the following question in your own words.
What factors are important to get a distinct echo?
