WB JEE 2008 | Waves Question 5 | Physics

WB JEE 2008

MCQ (Single Correct Answer)

-0.25

Two turning forks of frequencies n₁ and n₂ produces n beats per second. If n₂ and n are known, n₁ may be given by

$${{{n_2}} \over n} + {n_2}$$

$${n_2}n$$

$${n_2}\, \pm \,n$$

$${{{n_2}} \over n} - {n_2}$$

WB JEE 2008

MCQ (Single Correct Answer)

-0.25

A car moving with a velocity of 36 km/hr crosses a siren of frequency 500 Hz. The apparent frequency of siren after passing it will be

520 Hz

485 Hz

540 Hz

460 Hz

WB JEE 2023

MCQ (Single Correct Answer)

-0.25

The displacement of a plane progressive wave in a medium, travelling towards positive x-axis with velocity 4 m/s at t = 0 is given by $$y = 3\sin 2\pi \left( { - {x \over 3}} \right)$$. Then the expression for the displacement at a later time t = 4 sec will be

$$y = 3\sin 2\pi \left( { - {x-16 \over 3}} \right)$$

$$y = 3\sin 2\pi \left( { {-x-16 \over 3}} \right)$$

$$y = 3\sin 2\pi \left( { {-x+1 \over 3}} \right)$$

$$y = 3\sin 2\pi \left( { {-x-1 \over 3}} \right)$$

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