A person standing between two vertical cliffs and 640 metres away from the nearest cliff shouted. He heard the first echo after 4 sec and the second echo after 3 sec. Calculate :(i) the velocity of sound in air(ii) distance between the two cliffs
Answers
Answered by
5
Speed = Distance/Time
Distance = 640
Time = 4/2
(i) Velocity of sound
= (640)/(4/2)
= 320 m/s
__________________
320 = 2x/7
x = 160×7
x = 1120 m
__________________
(ii) Distance between two cliffs
= x+640
= 1120+640
= 1760 m
=====================
Distance = 640
Time = 4/2
(i) Velocity of sound
= (640)/(4/2)
= 320 m/s
__________________
320 = 2x/7
x = 160×7
x = 1120 m
__________________
(ii) Distance between two cliffs
= x+640
= 1120+640
= 1760 m
=====================
Anonymous:
Shubham ur answer is wrong i think ...
I think the answer is right...
Because for the second sound it reaches the person after being reflected from the second cliff
The time interval is 3+4 = 7...I think.
I don't know about that!!!!!!!!!!!!!!
Answered by
4
i)
Distance , d = 640 m
Time = 4 sec
2 d = v × t
2× 640 = v × 4
1280 = v × 4
v = 1280 ÷ 4
= 320 m/s
Velocity of sound in air = 320 m/s
==================================================================================
2)
v = 320 m/s
t = 3 sec
2 d = v × t
= 320 × 3
= 960
d = 960 ÷ 2
d = 480 m
Distance of the person from the nearest cliff = 640 m
Distance of the person from the other cliff = 480 m
Distance between the cliffs = 640 + 480
= 1120 metres
Distance , d = 640 m
Time = 4 sec
2 d = v × t
2× 640 = v × 4
1280 = v × 4
v = 1280 ÷ 4
= 320 m/s
Velocity of sound in air = 320 m/s
==================================================================================
2)
v = 320 m/s
t = 3 sec
2 d = v × t
= 320 × 3
= 960
d = 960 ÷ 2
d = 480 m
Distance of the person from the nearest cliff = 640 m
Distance of the person from the other cliff = 480 m
Distance between the cliffs = 640 + 480
= 1120 metres
The question says that the second echo is heard 3 sec after first echo
so the total time for second echo will be 3+4 = 7 sec
no yaar
how can tht be ?
hey read the question properly yaar !
its not given 3 sec after 1st echo
it is given tht second echo reached 3 sec after reflection ...
then how the echo from the nearest cliff will be heard after the echo from another cliff
:(
I don't know about that
Similar questions