Question

Fork A (n_A = 50 Hz) produces 2 beats/sec with fork B, on filing A, beat frequency becomes 1, calculate n_b. -

• A. 48 Hz
• B. 52 Hz
• C. Both
• D. None

Answer 1

Answer: (A)

48 Hz

Answer 2

Comparing the equation with the standard equation,

y = a sin $\frac{2\pi}{\lambda}$ (vt – x)

we get $\frac{2\pi}{\lambda}$= 0.1p or l = 20 m

\ The distance travelled = 20 m × 30 = 600 m