1
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the
A
infrared region
B
X-ray region
C
Ultraviolet region
D
Visible region
2
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 $$ \times $$ 106 m s$$-$$1. The velocity of the particle is
A
3 $$ \times $$ 10$$-$$31 ms$$-$$1
B
$$2.7 \times {10^{ - 21}}\,m{s^{ - 1}}$$
C
2.7 $$ \times $$ 10$$-$$18 ms$$-$$1
D
9 $$ \times $$ 10$$-$$2 ms$$-$$1
3
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of
A
collisions between the charged particles emitted from the cathode and the atoms of the gas
B
collision between different electrons of the atoms of the gas
C
excitation of electrons in the atoms
D
collision between the atoms of the gas
4
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
Monochromatic light of frequency 6.0 $$ \times $$ 1014 Hz is produced by a laser. The power emitted is 2 $$ \times $$ 10$$-$$3 W. The number of photons emitted, on the average, by the source per second is
A
5 $$ \times {10^{16}}$$
B
5 $$ \times {10^{17}}$$
C
5 $$ \times {10^{14}}$$
D
5 $$ \times {10^{15}}$$
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