Subject: Science, asked on 31/1/18

## What is amplitude

Subject: Science, asked on 30/1/18

## Is transverse waves are up to down waves or to and fro movement ways

Subject: Science, asked on 28/1/18

## What is a sound?

Subject: Science, asked on 26/1/18

## Question):- In the figure given below, a force F parallel to the slope and having a magnitude of 20 N pushes a block of mass 3 kg with a constant speed.  If the initial and final positions of the block are P and Q, respectively, then calculate (i) the work done by the force in moving the block from P to Q (ii) the change in potential energy of the block (iii) the amount of energy lost due to friction (Take g = 10 m/s2)

Subject: Science, asked on 26/1/18

## explain working of megaphone

Subject: Science, asked on 24/1/18

## A stone is dropped from the top of a tower 500m high into a pond of water at the base of the tower . When is the splash heard at the top?given g =10m s^2 and speed of sound =340 /s

Subject: Science, asked on 24/1/18

## 12.  Waves of frequency 150 Hz are produced in a string.  Find the (a)  wavelength, (b) amplitude and (c) velocity of the waves in SI units.

Subject: Science, asked on 24/1/18

## Solve this: A person standing between two vertical cliffs and 640 m away from the nearest cliff shouted. He  heard the first echo after 4 seconds and the second echo 3 seconds later. Calculate. (a) the velocity of sound in air, and (b) the distance between the cliffs

Subject: Science, asked on 24/1/18

## Q.12. Briefly mention the three uses of ultrasound in the field of medicine.

Subject: Science, asked on 24/1/18

## Q.5.(b). What is the sound board? Explain its working with the help of a diagram.

Subject: Science, asked on 23/1/18

## why are the ceilings of concert halls curved?

Subject: Science, asked on 23/1/18

## how to represent the audible range of sound by human with due respect of the time???

Subject: Science, asked on 16/1/18

## define wave length and pitch , write the relation of the quantity that determines pitch with wavelength and velocity of a wave

Subject: Science, asked on 16/1/18

## The sound of an explosion on a surface of the lake is heard by a men 150 m away and by a driver 150 m below the point of explosion. answer the following. a) Explain who will hear the sound of explosion first. b) If sound takes t sec to reach the man, how much time will it take to reach the driver ? ( Speed of sound in air is 344m/sec and in water is 1533m/sec) c) Give the audible range of the man . Give one example each of organisms which use waves of (i) lower than (ii) higher than this range.

Subject: Science, asked on 16/1/18

## A. Define the following characteristics of sound . i)pitch. ii)LOudness iii)quality B. A boy receives his echo 3 seconds later. Find the distance of the reflecting surface from the boy. Speed of sound in Air is     342m/s.

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