1

JEE Main 2020 (Online) 6th September Morning Slot

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

A sound source S is moving along a straight track with speed v, and is emitting, sound of frequency
v

(t

_{0}(see figure). An observer is standing at a finite distance, at the point O, from the track. The time variation of frequency heard by the observer is best represented by:_{}(t

_{0}represents the instant when the distance between the source and observer is minimum)2

JEE Main 2020 (Online) 5th September Evening Slot

MCQ (Single Correct Answer)

+4

-1

Out of Syllabus

A driver in a car, approaching a vertical wall
notices that the frequency of his car horn, has
changed from 440 Hz to 480 Hz, when it gets
reflected from the wall. If the speed of sound in
air is 345 m/s, then the speed of the car is :

3

JEE Main 2020 (Online) 5th September Morning Slot

MCQ (Single Correct Answer)

+4

-1

Assume that the displacement(s) of air is
proportional to the pressure difference ($$\Delta $$p)
created by a sound wave. Displacement (s)
further depends on the speed of sound (v),
density of air ($$\rho $$) and the frequency (f). If
$$\Delta $$p ~ 10 Pa, v ~ 300 m/s, $$\rho $$ ~ 1 kg/m

^{3}and f ~ 1000 Hz, then s will be of the order of (take the multiplicative constant to be 1) :4

JEE Main 2020 (Online) 5th September Morning Slot

MCQ (Single Correct Answer)

+4

-1

In a resonance tube experiment when the tube
is filled with water up to a height of 17.0 cm
from bottom, it resonates with a given tuning
fork. When the water level is raised the next
resonance with the same tuning fork occurs at
a height of 24.5 cm. If the velocity of sound in
air is 330 m/s, the tuning fork frequency is :

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