1
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
Change Language
If Young's double slit experiment is done with white light, which of the following statements will be true?
A
All the bright fringes will be coloured.
B
All the bright fringes will be white.
C
The central fringe will be white.
D
No stable interference pattern will be visible.
2
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
Change Language
How the linear velocity v of an electron in the Bohr orbit is related to its quantum number n?
A
$$v \propto {1 \over n}$$
B
$$v \propto {1 \over {{n^2}}}$$
C
$$v \propto {1 \over {\sqrt n }}$$
D
$$v \propto n$$
3
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
Change Language
If the half-life of a radioactive nucleus is 3 days, nearly what fraction of the initial number of nuclei will decay on the third day? (Given, $$\root 3 \of {0.25} \approx 0.63$$)
A
0.63
B
0.5
C
0.37
D
0.13
4
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.25
Change Language
An electron accelerated through a potential of 10000 V from rest has a de-Broglie wave length $$\lambda$$. What should be the accelerating potential, so that the wavelength is doubled?
A
20000 V
B
40000 V
C
5000 V
D
2500 V
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12