1
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
Light of wavelength 500 nm is incifent on a metal with work function 2.28 eV. The de Broglie wavelength of the emitted electron is
A
$$ \ge $$ 2.8 $$ \times $$ 10$$-$$9 m
B
$$ \le $$ 2.8 $$ \times $$ 10$$-$$12 m
C
< 2.8 $$ \times $$ 10$$-$$10 m
D
< 2.8 $$ \times $$ 10$$-$$9 m
2
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A photoelectric surface is illuminated successively by monochromatic light of wavelength $$\lambda $$ and If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is
(h = Planck's constant, C = speed of light)
A
$${{2hc} \over \lambda }$$
B
$${{hc} \over {3\lambda }}$$
C
$${{hc} \over {2\lambda }}$$
D
$${{hc} \over \lambda }$$
3
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
A nucleus of uranium decays at rest into nuclei of thorium and helium. Then
A
The helium nucleus has more momentum than the thorium nucleus.
B
The helium nucleus has less kinetic energy than the thorium nucleus.
C
The helium nucleus has more kinetic energy than the thorium nucleus.
D
The helium nucleus has less momentum than the thorium nucleus.
4
AIPMT 2015
MCQ (Single Correct Answer)
+4
-1
In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is
A
$${{27} \over 5}$$
B
$${5 \over {27}}$$
C
$${4 \over 9}$$
D
$${9 \over 4}$$
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