1
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
A beam of electron passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field is switched off, and the same magnetic field is maintained, the electrons move
A
in a circular orbit
B
along a parabolic path
C
along a straight line
D
in an elliptical orbit.
2
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
A 5 watt source emits monochromatic light of wavelength 5000 $$\mathop A\limits^ \circ $$. When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m, the number of photoelectrons liberated will be reduced by a factor of
A
8
B
16
C
2
D
4
3
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
The momentum of a photon of energy 1 MeV in kg m/s will be
A
5 $$ \times $$ 10$$-$$22
B
0.33 $$ \times $$ 106
C
7 $$ \times $$ 10$$-$$24
D
10$$-$$22
4
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
In a discharge tube ionization of enclosed gas is produced due to collisions between
A
neutral gas atoms/molecules
B
positive ions and neutral atoms/molecules
C
negative electrons and neutral atoms/molecules
D
photons and neutral atoms/molecules.
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