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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 particle moving in a straight line covers half the distance with speed of 3 m/s
- A metal bar of length L and area of cross-section A is clamped between two rigid
- A bar magnet has a coercivity of 4×10³ Am⁻¹. It is placed inside a solenoid
- The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV,
- A coin placed on a rotating turn table just slips,if it is placed at a distance
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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