Question

Two closed end pipes when sounded together produce 5 beat per second. If their length are in the ratio 100 : 101, then fundamental notes produced by them are –

• A. 245, 250
• B. 250, 255
• C. 495, 500
• D. 500, 505

Answer 1

Answer: (B)

250, 255

Answer 2

$\frac{V}{\lambda_{1}}$ – $\frac{V}{\lambda_{2}}$ = 6

$\frac{V}{1}$ – $\frac{V}{1.02}$ = 6 \ V = $\frac{6 \times 1.02}{0.02}$ = $\frac{6 \times 51}{2}$

= 306 m/s