Navigate

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.

NEET2013
admin:

Related Questions

  1. A block slides from an inclination of 45°.If it takes time twice
  2. If λ₁ and λ₂ are the wavelengths of the first members of the Lyman and Paschen
  3. The position vector of a particle R as a function of time is given by
  4. According to Hook’s law of elasticity, if stress is increased, the ratio of stress
  5. In common base circuit of a transistor, current amplification factor is 0.95.