1
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
2
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
3
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100 kV then the de-Broglie wavelength associated with the electrons would
A
increase by 2 times
B
decrease by 2 times
C
decrease by 4 times
D
increase by 4 times
4
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is
A
1.8 V
B
1.3 V
C
0.5 V
D
2.3 V
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