JEE PHYSICS MCQ: WAVES

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Analyzing +4 | -1

Assertion(A): The fundamental frequency of an open organ pipe increases as the temperature is increased.

Reason(R): As the temperature increases, the velocity of sound increases more rapidly than length of the pipe.

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Correct option: A

Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

Option A is correct. The fundamental frequency of an open organ pipe increases with temperature because the velocity of sound increases more rapidly than the length of the pipe.

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The source of sound generating a frequency of

3\,\,kHz

reaches an observer with a speed of

0.5

times, the velocity of sound in air. The frequency heard by the observer is A source of sound emits waves with frequency

f\mathrm{ }Hz

V\mathrm{ }m/sec

. Two observers move away from this source in opposite directions each with a speed

0.2\,\,V

relative to the source. The ratio of frequencies heard by the two observers will be Assertion: The wave function of a pulse is given by

y = \frac{3}{{{{\left( {2x + 3t} \right)}^2} + 4}},

it propagates in

(– \mathrm{ve}) \,x

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Reason: The given wave function is of the form

y = f(kx +\omega t),

which represent a wave travelling in negative

X

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0.01\,\,s

. the fundamental frequency is A rope

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245 \mathrm{~g}

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wt. If it is fixed at one end and shaken by hand at the other end, what frequency of shaking will make it break up into three vibrating segments? Take

g=980 \mathrm{~cm} \mathrm{~s}^{-2}

T

is the reverberation time of an auditorium of volume

V