1
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25

X-rays of wavelength $$\lambda$$ gets reflected from parallel planes of atoms in a crystal with spacing d between two planes as shown in the figure. If the two reflected beams interfere constructively, then the condition for maxima will be, (n is the order of interference fringe)

A
$$\mathrm{d\tan\theta=n\lambda}$$
B
$$\mathrm{d\sin\theta=n\lambda}$$
C
$$\mathrm{2d\cos\theta=n\lambda}$$
D
$$\mathrm{2d\sin\theta=n\lambda}$$
2
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25

An interference pattern is obtained with two coherent sources of intensity ratio n : 1. The ratio $$\mathrm{{{{I_{\max }} - {I_{\min }}} \over {{I_{\max }} + {I_{\min }}}}}$$ will be maximum if

A
n = 1
B
n = 2
C
n = 3
D
n = 4
3
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25

In a Young's double slit experiment, the intensity of light at a point on the screen where the path difference between the interfering waves is $$\lambda$$, ($$\lambda$$ being the wavelength of light used) is I. The intensity at a point where the path difference is $${\lambda \over 4}$$ will be (assume two waves have same amplitude)

A
zero
B
I
C
$${I \over 2}$$
D
$${I \over 4}$$
4
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25

In Young's double slit experiment with a monochromatic light, maximum intensity is 4 times the minimum intensity in the interference pattern. What is the ratio of the intensities of the two interfering waves?

A
1/9
B
1/3
C
1/16
D
1/2
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