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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
- A,B and C are voltmeters of resistance R, 1.5 R and 3R respectively, as shown
- A charge of 40 µC is given to a capacitor having capacitance C=10 µF
- A particle with charge q is moving along a circle of radius R with unoform speed v.
- A radio isotope X with a half life 1.4 x 10⁹ years decays to Y which is stable
- If the minimum energy of photons needed to produce photoelectrons is 3 eV,
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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