Rajasthan BoardEnglish MediumSTD 9ScienceSound2 Marks
Question
An echo is returned in 6s. What is the distance of reflecting surface from source? [given that speed of sound is 342m/s]
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Answer
Speed of sound, u = 342m/s
Time taken for hearing the echo, t = 6s
Distance travelled by the sound, u × t = 342 × 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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