1
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language
When a metallic surface is illuminated with radiation of wavelength $$\lambda $$, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2 $$\lambda $$, the stopping potential is $${V \over 4}$$. The threshold wavelength for the metallic surface is
A
$${5 \over 2}\lambda $$
B
3$$\lambda $$
C
4$$\lambda $$
D
5$$\lambda $$
2
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language
An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is
A
$$c{\left( {2mE} \right)^{{1 \over 2}}}$$
B
$${1 \over c}{\left( {{{2m} \over E}} \right)^{{1 \over 2}}}$$
C
$${1 \over c}{\left( {{E \over {2m}}} \right)^{{1 \over 2}}}$$
D
$${\left( {{E \over {2m}}} \right)^{{1 \over 2}}}$$
3
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language
When an $$\alpha $$-particle of mass m moving with velocity v bombards on a heavy nucleus of charge Ze, its distance of closest approach from the nucleus depends on m as
A
$${1 \over {{m^2}}}$$
B
m
C
$${1 \over m}$$
D
$${1 \over {\sqrt m }}$$
4
NEET 2016 Phase 1
MCQ (Single Correct Answer)
+4
-1
Change Language
Given the value of Rydberg constant is 107 m$$-$$1, the wave number of the last line of the Balmer series in hydrogen spectrum will be
A
0.25 $$ \times $$ 107 m$$-$$1
B
2.5 $$ \times $$ 107 m$$-$$1
C
0.025 $$ \times $$ 104 m$$-$$1
D
0.5 $$ \times $$ 107 m$$-$$1
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