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1
JEE Main 2022 (Online) 29th June Morning Shift
+4
-1
English
Hindi

A longitudinal wave is represented by $$x = 10\sin 2\pi \left( {nt - {x \over \lambda }} \right)$$ cm. The maximum particle velocity will be four times the wave velocity if the determined value of wavelength is equal to :

A
2$$\pi$$
B
5$$\pi$$
C
$$\pi$$
D
$${{5\pi } \over 2}$$
2
JEE Main 2022 (Online) 28th June Morning Shift
+4
-1
English
Hindi

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
3
JEE Main 2022 (Online) 27th June Evening Shift
+4
-1
English
Hindi

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

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%
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