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 common emitter amplifier gives an output of 3 V for an input of 0.01 V.
  2. The ionisation energy of hydrogen is 13.6 eV. The energy of the photon released
  3. The wavelength of Kα line in copper is 1.5Å. The ionisation energy of K electron in copper is
  4. In an L-C-R series resonant circuit, the capacitance is changed from C to 4C.
  5. Slope of PV and V for an isobaric process will be