JEE PHYSICS MCQ: WAVES

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Analyzing +4 | -1

Two stationary sources of sound,

S_1

and

S_2

having an equal frequency are fixed some distance apart. The position A is left of

S_1

, position B in the middle of the two sources and position C is to the right of

S_2

. An observer starts moving with velocity

V_0

from position A towards

S_1

, then

View answer and explanation

Correct option: C

beats will be not heard for A and C but will be heard for B

Option C (beats will be not heard for A and C but will be heard for B) is correct because at A and C, the observer is moving directly towards or away from both sources, while at B, the motion is towards one source and away from the other.

More Questions from WAVES

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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

and speed

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

-direction.
Reason: The given wave function is of the form

y = f(kx +\omega t),

which represent a wave travelling in negative

X

-direction. In the fundamental mode, time taken by the wave to reach the closed end of the air filled pipe is

0.01\,\,s

. the fundamental frequency is A rope

5 \mathrm{~m}

long has a total mass of

245 \mathrm{~g}

. It is stretched with a constant tension of

1 \mathrm{~kg}

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}

. If

T

is the reverberation time of an auditorium of volume

V

then