JEE Main 2021 (Online) 27th August Evening Shift | Wave Optics Question 56 | Physics

The light waves from two coherent sources have same intensity I₁ = I₂ = I₀. In interference pattern the intensity of light at minima is zero. What will be the intensity of light at maxima?

I₀

2 I₀

5 I₀

4 I₀

JEE Main 2021 (Online) 27th July Morning Shift

MCQ (Single Correct Answer)

-1

In Young's double slit experiment, if the source of light changes from orange to blue then :

the central bright fringe will become a dark fringe.

the distance between consecutive fringes will decrease.

the distance between consecutive fringes will increases.

the intensity of the minima will increase.

JEE Main 2021 (Online) 25th July Morning Shift

MCQ (Single Correct Answer)

-1

In the Young's double slit experiment, the distance between the slits varies in time as
d(t) = d₀ + a₀ sin$$\omega$$t; where d₀, $$\omega$$ and a₀ are constants. The difference between the largest fringe width and the smallest fringe width obtained over time is given as :

$${{2\lambda D({d_0})} \over {(d_0^2 - a_0^2)}}$$

$${{2\lambda D{a_0}} \over {(d_0^2 - a_0^2)}}$$

$${{\lambda D} \over {d_0^2}}{a_0}$$

$${{\lambda D} \over {{d_0} + {a_0}}}$$

JEE Main 2021 (Online) 20th July Evening Shift

MCQ (Single Correct Answer)

-1

With what speed should a galaxy move outward with respect to earth so that the sodium-D line at wavelength 5890 $$\mathop A\limits^o $$ is observed at 5896 $$\mathop A\limits^o $$ ?

306 km/sec

322 km/sec

296 km/sec

336 km/sec

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