1
JEE Main 2021 (Online) 18th March Evening Shift
Numerical
+4
-1
Change Language
A galaxy is moving away from the earth at a speed of 286 kms$$-$$1. The shift in the wavelength of a redline at 630 nm is x $$\times$$ 10$$-$$10 m. The value of x, to the nearest integer, is ____________. [Take the value of speed of light c, as 3 $$\times$$ 108 ms$$-$$1]
Your input ____
2
JEE Main 2021 (Online) 16th March Morning Shift
Numerical
+4
-1
Change Language
A fringe width of 6 mm was produced for two slits separated by 1 mm apart. The screen is placed 10 m away. The wavelength of light used is 'x' nm. The value of 'x' to the nearest integer is ____________.
Your input ____
3
JEE Main 2021 (Online) 24th February Morning Shift
Numerical
+4
-1
Change Language
An unpolarised light beam is incident on the polarizer of a polarization experiment and the intensity of light beam emerging from the analyzer is measured as 100 Lumens. Now, if the analyzer is rotated around the horizontal axis (direction of light) by 30$$^\circ$$ in clockwise direction, the intensity of emerging light will be _________ Lumens.
Your input ____
4
JEE Main 2020 (Online) 6th September Evening Slot
Numerical
+4
-0
Change Language
A Young's double-slit experiment is performed using monochromatic light of wavelength $$\lambda $$. The intensity of light at a point on the screen, where the path difference is $$\lambda $$, is K units. The intensity of light at a point where the path difference is $${\lambda \over 6}$$ is given by $${{nK} \over {12}}$$, where n is an integer. The value of n is __________.
Your input ____
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