JEE PHYSICS MCQ: WAVES

1 Medium

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Analyzing +4 | -1

Statement-I: Beats can be observed by two light sources as in sound.
Statement-II: To observe beats by two light sources, the phase difference between the two sources should change regularly.

View answer and explanation

Correct option: C

Both statement-I

\&

II are correct

Option C (Both statement-I & II are correct) is correct because beats can be observed with light sources if the phase difference changes regularly.

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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

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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

5 \mathrm{~m}

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245 \mathrm{~g}

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. If

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