1
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
An $$\alpha $$-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 Wb/m2. The de Broglie wavelength associated with the particle will be
A
1 $$\mathop A\limits^ \circ $$
B
0.1 $$\mathop A\limits^ \circ $$
C
10 $$\mathop A\limits^ \circ $$
D
0.01 $$\mathop A\limits^ \circ $$
2
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
The threshold frequency for a photosensitive metal is 3.3 $$ \times $$ 1014 Hz. If light of frequency 8.2 $$ \times $$ 1014 Hz is incident on this metal, the cut- off voltage for the photoelectron emission is nearly
A
1 V
B
2 V
C
3 V
D
5 V
3
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
Photoelectric emission occurs only when the incident light has more than a certain minimum
A
power
B
wavelength
C
intensity
D
frequency
4
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by
A
increasing the potential difference between the anode and filament
B
increasing the filament current
C
decreasing the filament current
D
decreasing the potential difference between the anode and flament
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