1
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-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 $$\mathop A\limits^o$$ ?
A
306 km/sec
B
322 km/sec
C
296 km/sec
D
336 km/sec
2
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
In Young's double slit arrangement, slits are separated by a gap of 0.5 mm, and the screen is placed at a distance of 0.5 m from them. The distance between the first and the third bright fringe formed when the slits are illuminated by a monochromatic light of 5890 $$\mathop A\limits^o$$ is :-
A
1178 $$\times$$ 10$$-$$9 m
B
1178 $$\times$$ 10$$-$$6 m
C
1178 $$\times$$ 10$$-$$12 m
D
5890 $$\times$$ 10$$-$$7 m
3
JEE Main 2021 (Online) 26th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
In a Young's double slit experiment two slits are separated by 2 mm and the screen is placed one meter away. When a light of wavelength 500 nm is used, the fringe separation will be :
A
0.50 mm
B
0.25 mm
C
1 mm
D
0.75 mm
4
JEE Main 2021 (Online) 25th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 $$\mu$$m. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that:
A
its size increases, but intensity decreases
B
its size increases, and intensity increases
C
its size decreases, but intensity increases
D
its sizes decreases, and intensity decreases
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