1
JEE Main 2022 (Online) 28th June Morning Shift
+4
-1

The velocity of sound in a gas, in which two wavelengths 4.08 m and 4.16 m produce 40 beats in 12s, will be :

A
282.8 ms$$-$$1
B
175.5 ms$$-$$1
C
353.6 ms$$-$$1
D
707.2 ms$$-$$1
2
JEE Main 2022 (Online) 27th June Evening Shift
+4
-1

If a wave gets refracted into a denser medium, then which of the following is true?

A
wavelength, speed and frequency decreases.
B
wavelength increases, sped decreases and frequency remains constant.
C
wavelength and speed decreases but frequency remains constant.
D
wavelength, speed and frequency increases.
3
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%
4
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
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