Question

hi guys
.....
an echo was heard after 3 sec. what is the distance of reflecting surface from the source, given that the speed of source is 342 m/s
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Answer 1

$\large{\textbf{Distance of reflecting surface from source =513 m }}$

$\huge{\textbf{\underline{As per Question:-}}}$

Time = 3 second

Speed of the sound = 342 m/s

$\huge{\textbf{\underline{To solve :-}}}$

Distance of reflecting surface from source.

$\huge{\textbf{\underline{Solution:-}}}$

$\large{\text{\underline{Time taken by echo to return :-}}}$

$t = \dfrac{T}{2}$

$t = \dfrac{3}{2}$

$t = 1.5 s$

$\large{\textbf{ Distance = Speed \times time }}$

Distance of the reflecting surface from the source is :-

$Distance = 342 \times \dfrac{15}{10}$

$Distance = \dfrac{5130}{10}$

$\therefore\textbf{Distance = 513 m }$

Answer 2

Answer:

S = v ×t

= 342×3

therefore

S/2 =342×3/2

= 171×3=513 m is the distance...