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. Volume of gas becomes four times if temperature becomes
  2. Heat is flowing through a rod of length 50 cm and area of cross-section 5 cm².
  3. The dimensions of universal gas constant are
  4. The maximum wavelength of radiations emitted at 900K is 4 µm. What will be the maximum
  5. A body of mass 2 kg travels according to the law x(t)=pt+qt²+rt³