1
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

If the kinetic energies of an electron, an alpha particle and a proton having same de-Broglie wavelength are $${\varepsilon _1},{\varepsilon _2}$$ and $${\varepsilon _3}$$ respectively, then

A
$${\varepsilon _1} > {\varepsilon _3} > {\varepsilon _2}$$
B
$${\varepsilon _1} = {\varepsilon _3} = {\varepsilon _2}$$
C
$${\varepsilon _1} < {\varepsilon _3} < {\varepsilon _2}$$
D
$${\varepsilon _1} > {\varepsilon _2} > {\varepsilon _3}$$
2
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

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
$${I \over 4}$$
3
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

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
4
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

The human eye has an approximate angular resolution of $$\theta$$ = 5.8 $$\times$$ 10$$-$$4 rad and typical photo printer prints a minimum of 300 dpi (dots per inch, 1 inch = 2.54 cm). At what minimal distance d should a printed page be held so that one does not see the individual dots?

A
20.32 cm
B
29.50 cm
C
14.59 cm
D
6.85 cm
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