1

JEE Main 2020 (Online) 7th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

A stationary observer receives sound from two identical tuning forks, one of which approaches
and the other one recedes with the same speed (much less than the speed of sound). The
observer hears 2 beats/sec. The oscillation frequency of each tuning fork is v

_{0}= 1400 Hz and the velocity of sound in air is 350 m/s. The speed of each tuning fork is close to :2

JEE Main 2020 (Online) 7th January Morning Slot

MCQ (Single Correct Answer)

+4

-1

Speed of a transverse wave on a straight wire (mass 6.0 g, length 60 cm and area of cross-section 1.0 mm

^{2}) is 90 ms^{-1}. If the Young's modulus of wire is 16 $$ \times $$ 10^{11}Nm^{-2}, the extension of wire over its natural length is :3

JEE Main 2019 (Online) 12th April Evening Slot

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

Two sources of sound S

_{1}and S_{2}produce sound waves of same frequency 660 Hz. A listener is moving from source S_{1}towards S_{2}with a constant speed u m/s and he hears 10 beats/s. The velocity of sound is 330 m/s. Then, u equals :4

JEE Main 2019 (Online) 12th April Evening Slot

MCQ (Single Correct Answer)

+4

-1

A tuning fork of frequency 480 Hz is used in an experiment for measuring speed of sound (v) in air
by resonance tube method. Resonance is observed to occur at two successive lengths of the air column,
l

_{1}= 30 cm and l_{2}= 70 cm. Then, v is equal to -Questions Asked from Waves (MCQ (Single Correct Answer))

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