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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound2 Marks
Question
An echo is returned in 6 seconds. What is the distance of reflecting surface from source? [given that speed of sound is 342m/ s.]
✓

Answer

Speed of sound $u = 342 \ \text{m/s}$
Time taken for hearing the echo, $t = 6s$
Distance travelled by the sound, $u \times t = 342 \times 6 = 2052$
$\text{Speed}=\frac{\text{distance}}{\text{time}}$
so, distance of the reflecting surface from the source $=\frac{2052}{2}$
$=1026\text{m}$

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