1
JEE Main 2022 (Online) 27th June Morning Shift
+4
-1

An observer moves towards a stationary source of sound with a velocity equal to one-fifth of the velocity of sound. The percentage change in the frequency will be :

A
20%
B
10%
C
5%
D
0%
2
JEE Main 2022 (Online) 26th June Evening Shift
+4
-1

For a specific wavelength 670 nm of light coming from a galaxy moving with velocity v, the observed wavelength is 670.7 nm. The value of v is :

A
3 $$\times$$ 108 ms$$-$$1
B
3 $$\times$$ 1010 ms$$-$$1
C
3.13 $$\times$$ 105 ms$$-$$1
D
4.48 $$\times$$ 105 ms$$-$$1
3
JEE Main 2022 (Online) 24th June Evening Shift
+4
-1

Two massless springs with spring constants 2 k and 9 k, carry 50 g and 100 g masses at their free ends. These two masses oscillate vertically such that their maximum velocities are equal. Then, the ratio of their respective amplitudes will be :

A
1 : 2
B
3 : 2
C
3 : 1
D
2 : 3
4
JEE Main 2022 (Online) 24th June Morning Shift
+4
-1

The equations of two waves are given by :

y1 = 5 sin 2$$\pi$$(x - vt) cm

y2 = 3 sin 2$$\pi$$(x $$-$$ vt + 1.5) cm

These waves are simultaneously passing through a string. The amplitude of the resulting wave is :

A
2 cm
B
4 cm
C
5.8 cm
D
8 cm
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