Question

In a resonance tube with tuning fork of frequency 512 Hz, first resonance occurs at water level equal to 30.3 cm and second resonance occurs at 63.7cm. The maximum possible error in the speed is –

• A. 51.2 cm/sec.
• B. 102.4 cm/sec
• C. 204.8 cm/sec
• D. 153.6 cm/sģ

Answer 1

Answer: (C)

204.8 cm/sec

Answer 2

v = 2n ($\mathcal{l}$₂ – $\mathcal{l}$₁)

Dv= 2n (Dl₂ + Dl₁ )

= 2 × 512 × (0.1 + 0.1) = 204.8 cm/sec.