Echo, Reverberation and Acoustics

Define Acoustics and list some of its applications.

A person clapped his hands near a cliff and heard the echo after $4 \mathrm{s}$. The distance between the cliff and the person will be :

(Speed of sound is $346 \mathrm{m} {\mathrm{s}}^{-1}$) 

If the velocity of sound in air is $340 \mathrm{m} {\mathrm{s}}^{-1}$ and $x$ is the minimum distance between sound source and reflecting surface to get echo from general sound, then :

What good acoustics mean?

Walls of auditorium should be

In question 93, if Suresh were standing unsymmetrically between parallel cliffs, the distance between two cliffs is

Suresh standing symmetrically between two cliffs claps his hands and starts hearing a series of echoes at intervals of 1 second. If speed of sound in air is 340 m/s, the distance between the parallel cliffs must be

Echo is produced due to

The persistence of hearing for human beings is not more than

_____  is used to split kidney stones into smaller pieces without invasive surgery.

SONAR is an application of acoustics.

Define Echelon effect?

The branch of physics which deals with the study of production, transmissions and reception of sound is called?

Write the medical application of acoustics?

A reflection of sound, arriving at the listener in less than $0.1 \mathrm{s}$ after the direct sound is called _____.

A reflection of sound, arriving at the listener in less than $0.1 \mathrm{s}$ after the direct sound is called _____.

The minimum distance required to hear a distinct echo from the source of sound is _____ $(17.2 / 20.1)$ metre.

A man standing far from a hill, fires a gun and hears its echo after $4 \mathrm{s}$. Later he moves $320 \mathrm{m}$ from his initial position away from the hill and fires the gun again and now he hears the echo after $6 \mathrm{s}$. Then the velocity of the sound in air is

State and derive a condition for echo to be heard.  Explain how bats catch their prey.

Define echo. An echo is heard after $3 \mathrm{s}$. Find the distance of reflecting surface from the source given that speed of sound is $342$ $\mathrm{m}/\mathrm{s}$.