Question

When the wavelength of sound changes from 1 m to 1.01 m, the number of beats heard are 4. The velocity of sound is –

• A. 404 m/s
• B. 4.04 m/s
• C. 414 m/s
• D. 400 m/s

Answer 1

Answer: (A)

404 m/s

Answer 2

$\frac { 3 \mathrm {~V} } { 2 \ell }$ = or l = $\frac { 8 \mathrm {~m} } { 2 }$= 4m