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STD 11 - 14. waves and sound — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 14. waves and sound4 Marks
MCQ
A man standing on a cliff claps his hand hears its echo after $1 \,sec$. If sound is reflected from another mountain and velocity of sound in air is $340\, m/sec.$ Then the distance between the man and reflection point is  ..... $m$
  • A
    $680$
  • B
    $340$
  • C
    $85 $
  • ✓
    $170 $
✓

Answer

Correct option: D.
$170 $
d
If $d$ is the distance between man and reflecting surface of sound then for hearing echo

$2d = v \times t \Rightarrow d = \frac{{340 \times 1}}{2} = 170\,m$

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