An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s–1?
NCERT Class IX
Sciences - Main Course Book
Chapter 12. Sound
Answers
Answered by
89
Let the required distance be d m.
Sound travels 2d m in 3 s.
Speed of sound(v) = 342 m/s.
By the problem,
2d/3=342.
d = 513 m. (Ans.)
Sound travels 2d m in 3 s.
Speed of sound(v) = 342 m/s.
By the problem,
2d/3=342.
d = 513 m. (Ans.)
Answered by
24
t = 3 sec
v = 340 m/s
2d = v × t
= 340 × 3
= 1020 m
d = 1020 ÷ 2
= 510 metres
distance of the reflecting surface fro the source = 510 m
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