Question

A syllable can be uttered in 1/5 s.

It is given that an echo repeats two syllables. If the velocity of sound is 330 m/s, then the distance of the reflecting surface is:

• A. 66.0 m
• B. 33.0 m
• C. 99.0 m
• D. 16.5 m

Answer 1

The correct option is A 66.0 m

Time taken for two syllables $t=\frac{2}{5}sec$

$x+x=v\times t=330\times \frac{2}{5}$

$\therefore x=66m$