JEE Main 2022 (Online) 28th June Morning Shift | Waves Question 20 | Physics

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JEE Main 2022 (Online) 28th June Morning Shift

MCQ (Single Correct Answer)

-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 :

282.8 ms^$$-$$1

175.5 ms^$$-$$1

353.6 ms^$$-$$1

707.2 ms^$$-$$1

JEE Main 2022 (Online) 27th June Evening Shift

MCQ (Single Correct Answer)

-1

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

wavelength, speed and frequency decreases.

wavelength increases, sped decreases and frequency remains constant.

wavelength and speed decreases but frequency remains constant.

wavelength, speed and frequency increases.

JEE Main 2022 (Online) 27th June Morning Shift

MCQ (Single Correct Answer)

-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 :

20%

10%

JEE Main 2022 (Online) 26th June Evening Shift

MCQ (Single Correct Answer)

-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 :

3 $$\times$$ 10⁸ ms^$$-$$1

3 $$\times$$ 10¹⁰ ms^$$-$$1

3.13 $$\times$$ 10⁵ ms^$$-$$1

4.48 $$\times$$ 10⁵ ms^$$-$$1

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