Advertisements
Advertisements
Question
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.
Solution
We have to calculate the distance between the reflecting surface and the observer.
Given: Time taken to hear the echo t = 5 s.
So time taken for sound to reach the reflecting surface (`t_r`) = `5/2` s
Speed of sound in air ν = 342 m/s
Therefore, distance of reflecting surface from the observer is
= `(v) xx (t_r)`
= `(342) xx (5/2)` m
= 855 m
APPEARS IN
RELATED QUESTIONS
When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
Name three devices which work on the reflection of sound.
What is the other name of a loud-hailer ?
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 ?
Name any two objects which are good reflectors of sound.
What is the minimum distance in air required from a sound reflecting surface to hear an echo (at 20°C) ?
Which of the following device does not work on the multiple reflections of sound waves ?
What is an echo?
How can you calculate the speed of sound using echo?
______ allows bats to navigate through dark caves and find insects for food.
