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A person is standing at a distance D from an isotropic point source of sound. He walks 50.0 m towards the source and observes that the intensity of the sound has doubled. His initial distance D from the source is
nearly 170.7m
How long will it take sound waves to travel a distance between points A and B if the air temperature between them varies linearly from T_{1} toT_{2}? (The velocity of sound in air at temperature T is given by v=α√t, where a is a constant)
Two sources S_{1} and S_{2} of same frequencyfemits sound. The sources are moving as shown with speed u each. A stationary observer hears that sound. The beat frequency is (v = velocity of sound)
A wire of density 9×10^{3 }kg/m^{3} is stretched between two clamps 1 m apart and is subjected to an extension of 4.9×10^{4} m. What is the lowest frequency (in Hz) of transverse vibration in the wire?
The difference between the apparent frequency of a source of sound as perceived by an observer during its approach and recession is 2% of the natural frequency of the source. If the velocity of sound in air is 300 m/sec, what is the velocity (in m/s) of the source? (It is given that velocity of source << velocity of sound)
Two identical sounds S_{1} and S_{2} reach at a point P in phase. The resultant loudness at point P is ndB higher than the loudness of S_{1}. What is the value of n?
https://doubtnut.com/questionanswerphysics/twoidenticalsounds1ands2reachatapointpisphasetheresultantloudnessatpointpisndb11750291
Wavelengths of two notes in air are 1 m and1/164m. Each note produces 1 beat/s with a third note of a fixed frequency. What is the speed (in m/s) of sound in air?
The displacementyof a particle executing periodic motions given byy=4cos^{2}t/2(sin1000t).How many independent harmonic motions may be considered to superpose to result this expression.
A tube closed at one end and containing air is excited. It produces the fundamental note of frequency 512 Hz. If the same tube is open at both the ends the fundamental frequency that can be produced is [RPET 1999]
Fundamental frequency of open pipe is double that of the closed pipe.
A closed pipe and an open pipe have their first overtones identical in frequency. Their lengths are in the ratio [Roorkee 1999]
The first overtone in a closed pipe has a frequency [JIPMER 1999]
An empty vessel is partially filled with water, then the frequency of vibration of air column in the vessel [KCET 2000]
It is desired to increase the fundamental resonance frequency in a tube which is closed at one end. This can be achieved by [Roorkee 2000]
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