JEE Main 2019 Physics question
A tuning fork of frequency 480 Hz is used in an experiment for measuring speed of sound (v) in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column, = 30 cm and = 70 cm. Then, v is equal to:
Answer: (B)
Solution
λ/2 = 40 cm ⇒ v = 480 × 0.8.