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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.
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Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Three objects A,B and C are kept in a straight line on a frictionless horizontal surface
- A parallel beam of light of wavelength λ is incident normally on a narrow slit
- Electrons of mass m with de-Broglie wavelength λ fall on the target in an X-ray tube.
- A heavy nucleus at rest breaks into two fragments which fly off with velocities
- Which series of hydrogen spectrum corresponds to ultraviolet region?
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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