1

JEE Main 2021 (Online) 27th August Morning Shift

Numerical

+4

-1

Out of Syllabus

Two cars X and Y are approaching each other with velocities 36 km/h and 72 km/h respectively. The frequency of a whistle sound as emitted by a passenger in car X, heard by the passenger in car Y is 1320 Hz. If the velocity of sound in air is 340 m/s, the actual frequency of the whistle sound produced is .................. Hz.

Your input ____

2

JEE Main 2021 (Online) 26th August Evening Shift

Numerical

+4

-1

Two waves are simultaneously passing through a string and their equations are :

y

y

_{1}= A_{1}sin k(x $$-$$ vt), y_{2}= A_{2}sin k(x $$-$$ vt + x_{0}). Given amplitudes A_{1}= 12 mm and A_{2}= 5 mm, x_{0}= 3.5 cm and wave number k = 6.28 cm^{$$-$$1}. The amplitude of resulting wave will be ................ mm.Your input ____

3

JEE Main 2021 (Online) 26th August Morning Shift

Numerical

+4

-1

Out of Syllabus

A source and a detector move away from each other in absence of wind with a speed of 20 m/s with respect to the ground. If the detector detects a frequency of 1800 Hz of the sound coming from the source, then the original frequency of source considering speed of sound in air 340 m/s will be ............... Hz.

Your input ____

4

JEE Main 2021 (Online) 26th August Morning Shift

Numerical

+4

-1

Two travelling waves produces a standing wave represented by equation,

y = 1.0 mm cos(1.57 cm

The node closest to the origin in the region x > 0 will be at x = .............. cm.

y = 1.0 mm cos(1.57 cm

^{$$-$$1}) x sin(78.5 s^{$$-$$1})t.The node closest to the origin in the region x > 0 will be at x = .............. cm.

Your input ____

Questions Asked from Waves (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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