NCERT Solutions
Board Paper Solutions
Ask & Answer
School Talk
Login
GET APP
Login
Create Account
Popular
Latest
Expert Answers
ALL
Devesh Kumar Biswal
Subject: Science
, asked on 12/1/18
Q.18. The sound level at a point is increasing by 30 dB. By what factor is the amplitude increased?
Answer
1
Tanishk Singh Rawat
Subject: Science
, asked on 11/1/18
Solve this :
10. A disused railway line has a length of 300 m. A man puts his car against one end of the rail and another man hits the other end with a metal hammer, as shown in the figure .
(a) (i) State an approximate value for the speed of sound in air.
(ii) Sound travels at 5000 m/s in steel. calculate the time it takes for the sound travel along the rail .
Answer
1
Tanishk Singh Rawat
Subject: Science
, asked on 11/1/18
Solve this:
Q27. A construction worker's helmet slips and falls when he is 78.4 m above the ground. He hears the sound of the helmet bitting the ground 4.23 s after it slipped. Find the speed of sound in air.
Answer
1
Divyansh
Subject: Science
, asked on 10/1/18
We know that speed of sound in greater in medium which are more difficult to compress, but then according to the statement "speed of sound increases with decrease in density" (here of air) but now the more dense the air is, the more it is difficult to compress and so speed of sound must be greater, then how is the statement correct ?
Answer
1
Sanskriti Khare
Subject: Science
, asked on 9/1/18
Difference between transverse and longitudinal sound waves (3 points )
Answer
2
Diksha Mishra
Subject: Science
, asked on 9/1/18
Explain the principles of
Shehnais and trumplets
Answer
1
Tris Chowdhury
Subject: Science
, asked on 9/1/18
what is simple harmonic motion? Explain
Answer
1
Tanishk Singh Rawat
Subject: Science
, asked on 9/1/18
Please help me in doing this question. Also tell me how to find time period form a graph.
Q.5. The given graph shows the displacement versus time relation for a disturbance travelling with a velocity 1500
$m{s}^{-1}$
.
Calculate
(i) time period
(ii) frequency and
(iii) wavelength of disturbance
Answer
1
Devesh Kumar Biswal
Subject: Science
, asked on 8/1/18
Please slove question 5 with process
Answer
3
Devesh Kumar Biswal
Subject: Science
, asked on 8/1/18
Q. A stone is dropped by a man into a lake from a tower of height 500 m. What time will require hearing the splash of sound by the man ?
Answer
1
Devesh Kumar Biswal
Subject: Science
, asked on 8/1/18
Q. The length of the seconds pendulum is decreased by 0.3 cm when it is shifted to Chennai from London . If the acceleration due to gravity at London is 981 cm/sec
^{2}
,the acceleration due to gravity at Chennai is (assume
$\pi $
^{2}
= 10)
(A) 981 cm/sec
^{2}
(B) 978 cm/sec
^{2}
(C) 984 cm/sec
^{2}
^{ }
(D) 975 cm/sec
^{2}
Answer
1
Devesh Kumar Biswal
Subject: Science
, asked on 8/1/18
Please slove question 4 with process
Q4. The length of the seconds pendulum is decreased by 0.3 cm when it is shifted to chennai from London. If the acceleration due to gravity at London is 981 cm/sec
^{2}
, the acceleration due to gravity at chennai is (assume
$\mathrm{\pi}$
^{2}
=10):
(A) 981 cm/sec
^{2}
^{ }
(B) 978 cm/sec
^{2}
(C) 984 cm/sec
^{2}
(D) 975 cm/sec
^{2}
^{}
Answer
1
Devesh Kumar Biswal
Subject: Science
, asked on 7/1/18
Please solve question 1 with process
1.
A stone is dropped into a well of 80 m deep. The sound of splash is heard 4.20 sec after the stone is dropped. The velocity of sound in air
(A) 200 m/s (B) 400 m/s
(C) 600 m/s (D) 1200 m/s
Answer
2
Srujan Vooturi
Subject: Science
, asked on 7/1/18
Calculate time for which sound persists in our brain if 5he minimmum distance of the obstacle from the source of the sound is 17.2m
Answer
1
Vaishnavi Patil
Subject: Science
, asked on 5/1/18
When a pulse is sent through a slinky which physical quantity travels from it along its length?also identify the nature of wave produced
Answer
1
Prev
5
6
7
8
9
Next
What are you looking for?

10. A disused railway line has a length of 300 m. A man puts his car against one end of the rail and another man hits the other end with a metal hammer, as shown in the figure .

(ii) Sound travels at 5000 m/s in steel. calculate the time it takes for the sound travel along the rail .

Q27. A construction worker's helmet slips and falls when he is 78.4 m above the ground. He hears the sound of the helmet bitting the ground 4.23 s after it slipped. Find the speed of sound in air.

Shehnais and trumplets

Q.5. The given graph shows the displacement versus time relation for a disturbance travelling with a velocity 1500 $m{s}^{-1}$.

Calculate

(i) time period

(ii) frequency and

(iii) wavelength of disturbance

^{2},the acceleration due to gravity at Chennai is (assume $\pi $^{2}= 10)(A) 981 cm/sec

^{2}(B) 978 cm/sec^{2}(C) 984 cm/sec^{2}^{ }(D) 975 cm/sec^{2}Q4. The length of the seconds pendulum is decreased by 0.3 cm when it is shifted to chennai from London. If the acceleration due to gravity at London is 981 cm/sec

^{2}, the acceleration due to gravity at chennai is (assume $\mathrm{\pi}$^{2}=10):(A) 981 cm/sec

^{2}^{ }(B) 978 cm/sec^{2}(C) 984 cm/sec

^{2}(D) 975 cm/sec^{2}^{}1. A stone is dropped into a well of 80 m deep. The sound of splash is heard 4.20 sec after the stone is dropped. The velocity of sound in air

(A) 200 m/s (B) 400 m/s

(C) 600 m/s (D) 1200 m/s