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 glass slab consists of thin uniform layers of progressively decreasing refractive
  2. A charge of 40 µC is given to a capacitor having capacitance C=10 µF
  3. The electric potential at a point in free space due to a charge Q coulomb is Q x 10¹¹ v
  4. The total energy of an electron in the first excited state of hydrogen atom
  5. If a given volume of water in a 220V heater is boiled in 5 min, then same volume