1
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
A source of light is placed at a distance of 50 cm from a photo cell and the stopping potential is found to be V0. If the distance between the light source and photo cell is made 25 cm, the new stopping potential will be :
A
V0/2
B
V0
C
4V0
D
2V0
2
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
The de-broglie wavelength of neutrons in thermal equilibrium at temperature T is
A
$${{3.08} \over {\sqrt T }}\mathop A\limits^ \circ $$
B
$${{0.308} \over {\sqrt T }}\mathop A\limits^ \circ $$
C
$${{0.0308} \over {\sqrt T }}\mathop A\limits^ \circ $$
D
$${{30.8} \over {\sqrt T }}\mathop A\limits^ \circ $$
3
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
How does the Binding Energy per nucleon vary with the increase in the number of nucleons ?
A
Decrease continuously with mass number.
B
First decreases and then increases with increase in mass number.
C
First increases and then decreases with increase in mass number.
D
increases continuously with mass number.
4
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
An electron in hydrogen atom makes a transition n1 $$ \to $$ n2 where n1 and n2 are principal quantum numbers of the two states . Assuming Bohr's model to be valid, the time period of the electron in the initial state is eight times that in the final state. The possible values of n1 and n2 are
A
n1 = 6 and n2 = 2
B
n1 = 8 and n2 = 1
C
n1 = 8 and n2 = 2
D
n1 = 4 and n2 = 2
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