1
JEE Main 2021 (Online) 24th February Morning Shift
+4
-1
In a Young's double slit experiment, the width of the one of the slit is three times the other slit. The amplitude of the light coming from a slit is proportional to the slit-width. Find the ratio of the maximum to the minimum intensity in the interference pattern.
A
4 : 1
B
2 : 1
C
1 : 4
D
3 : 1
2
JEE Main 2020 (Online) 6th September Morning Slot
+4
-1
In the figure below, P and Q are two equally intense coherent sources emitting radiation of wavelength 20 m. The separation between P and Q is 5 m and the phase of P is ahead of that of Q by 90o. A, B and C are three distinct points of observation, each equidistant from the midpoint of PQ. The intensities of radiation at A, B, C will be in the ratio :

A
4 : 1 : 0
B
2 : 1 : 0
C
0 : 1 : 2
D
0 : 1 : 4
3
JEE Main 2020 (Online) 5th September Evening Slot
+4
-1
Two coherent sources of sound, S1 and S2, produce sound waves of the same wavelength, $$\lambda$$ = 1 m, in phase. S1 and S2 are placed 1.5 m apart (see fig). A listener, located at L, directly in front of S2 finds that the intensity is at a minimum
when he is 2 m away from S2. The listener moves away from S1, keeping his distance from S2 fixed. The adjacent maximum of intensity is observed when the listener is at a distance d from S1. Then, d is :
A
12 m
B
2 m
C
3 m
D
5 m
4
JEE Main 2020 (Online) 4th September Morning Slot
+4
-1
A beam of plane polarised light of large
cross-sectional area and uniform intensity
of 3.3 Wm-2 falls normally on a
polariser (cross sectional area 3 $$\times$$ 10-4 m2) which
rotates about its axis with an angular speed
of 31.4 rad/s. The energy of light passing through
the polariser per revolution, is close to :
A
1.0 $$\times$$ 10-5 J
B
1.0 $$\times$$ 10-4 J
C
1.5 $$\times$$ 10-4 J
D
5.0 $$\times$$ 10-4 J
EXAM MAP
Medical
NEET