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Harshit Singh Avengers
Subject: Science
, asked on 31/1/18
What is amplitude
Answer
4
Harshit Singh Avengers
Subject: Science
, asked on 30/1/18
Is transverse waves are up to down waves or to and fro movement ways
Answer
1
Harshit Singh Avengers
Subject: Science
, asked on 28/1/18
What is a sound?
Answer
5
Vaishnavi G
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/s
2
)
Answer
1
Sudesh D
Subject: Science
, asked on 26/1/18
explain working of megaphone
Answer
1
Aanvi
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
Answer
1
Tejas Goyal
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.
Answer
1
Tejas Goyal
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
Answer
1
Tejas Goyal
Subject: Science
, asked on 24/1/18
Q.12. Briefly mention the three uses of ultrasound in the field of medicine.
Answer
1
Tejas Goyal
Subject: Science
, asked on 24/1/18
Q.5.(b). What is the sound board? Explain its working with the help of a diagram.
Answer
1
Yash Pratap Singh
Subject: Science
, asked on 23/1/18
why are the ceilings of concert halls curved?
Answer
1
Devanshu
Subject: Science
, asked on 23/1/18
how to represent the audible range of sound by human with due respect of the time???
Answer
2
Devhuti
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
Answer
1
Devhuti
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.
Answer
2
Devhuti
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.
Answer
1
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What are you looking for?
(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)
(a) wavelength, (b) amplitude and (c) velocity of the waves in SI units.
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
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.