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Oscillations

# If the per of human ear is 0.4 s and the minimum distance for an echo is 50 m . Then find the speed of sound in the medium

$(a)\;125\;m/s\qquad(b)\;300\;m/s\qquad(c)\;250\;m/s\qquad(d)\;None\;of\;these$

Answer : (c) $\;250\;m/s$
Explanation :
Implies as that the wave travels 100 m (onward backward journey) in 0.4 m
Therefore , velocity of wave = $\;\large\frac{100}{0.4}$
$=\large\frac{100 \times 10}{4}=250$