A source of unknown frequency gives 4 beats/s, when sounded with a source harmonic

A source of unknown frequency gives 4 beats/s, when sounded with a source harmonic of the source of unknown frequency gives 5 beats/s, when sounded with a source of frequency 513 Hz. The unknown frequency is

Options

(a) 246 Hz
(b) 240 Hz
(c) 260 Hz
(d) 254 Hz

Correct Answer:

254 Hz

Explanation:

When sounded with a source of known frequency fundamental frequency = 250 +- 4 Hz. = 254 Hz or 246 Hz. second harmonic if unknown frequency (suppose) 254 Hz = 2 x 254 = 508 Hz. As it is gives 5 beats 508 + 5 = 513 Hz.
Hence, unknown frequency is 254 Hz.

admin:

Related Questions

  1. A perfect gas at 27° C is heated at constant pressure to 327° C. If original volume of gas
  2. Characteristic X-rays are produced due to
  3. A meter stick of mass 400 g is pivoted at one end and displaced through an angle 60°.
  4. A block of mass 10 kg is moving in X-direction with a constant speed of 10 ms⁻¹
  5. A particle executing simple harmonic motion of amplitude 5 cm has maximum