Question

A stone is dropped in a well which is 19.6m deep. Echo sound is heard after 2.06 sec (after dropping) then the velocity of sound is –

• A. 332.6 m/sec
• B. 326.7 m/sec
• C. 300.4 m/sec
• D. 290.5 m/sec

Answer 1

Answer: (B)

326.7 m/sec

Answer 2

t = $\frac { 2 \mathrm {~d} } { \mathrm {~V} } = \frac { 2 \times 19.6 } { \mathrm {~V} }$ , V = $\frac { 2 \times 19.6 } { 2.06 }$ m/s