MHT CET 2023 14th May Evening Shift | Waves Question 70 | Physics

A source of sound is moving towards a stationary observer with $$\left(\frac{1}{10}\right)^{\text {th }}$$ the of the speed of sound. The ratio of apparent to real frequency is

$$10: 9$$

$$11: 10$$

$$(11)^2:(10)^2$$

$$(9)^2:(10)^2$$

MHT CET 2023 14th May Morning Shift

MCQ (Single Correct Answer)

-0

A string is stretched between two rigid supports separated by $$75 \mathrm{~cm}$$. There are no resonant frequencies between $$420 \mathrm{~Hz}$$ and $$315 \mathrm{~Hz}$$. The lowest resonant frequency for the string is

$$210 \mathrm{~Hz}$$

$$180 \mathrm{~Hz}$$

$$105 \mathrm{~Hz}$$

$$1050 \mathrm{~Hz}$$

MHT CET 2023 14th May Morning Shift

MCQ (Single Correct Answer)

-0

A progressive wave is given by, $$\mathrm{Y}=12 \sin (5 \mathrm{t}-4 \mathrm{x})$$. On this wave, how far away are the two points having a phase difference of $$90^{\circ}$$ ?

$$\frac{\pi}{4}$$

$$\frac{\pi}{8}$$

$$\frac{\pi}{16}$$

$$\frac{\pi}{32}$$

MHT CET 2023 14th May Morning Shift

MCQ (Single Correct Answer)

-0

The equation of the wave is $$\mathrm{Y}=10 \sin \left(\frac{2 \pi \mathrm{t}}{30}+\alpha\right)$$ If the displacement is $$5 \mathrm{~cm}$$ at $$\mathrm{t}=0$$ then the total phase at $$\mathrm{t}=7.5 \mathrm{~s}$$ will be $$\left(\sin 30^{\circ}=0.5\right)$$

$$\frac{\pi}{3} \mathrm{~rad}$$

$$\frac{\pi}{2} \mathrm{~rad}$$

$$\frac{2 \pi}{5} \mathrm{~rad}$$

$$\frac{2 \pi}{3} \mathrm{~rad}$$

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