1
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
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
Photoelectric emission occurs only when the incident light has more than a certain minimum
A
power
B
wavelength
C
intensity
D
frequency
4
AIPMT 2010 Mains
MCQ (Single Correct Answer)
+4
-1
The electron in the hydrogen atom jumps from excited state (n = 3) to its ground state (n = 1) and the photons thus emitted irradiate a photosensitive material. If the work function of the material is 5.1 eV, the stopping potential is estimated to be (the energy of the electron in nth state En = $${{ - 13.6} \over {{n^2}}}eV$$)
A
5.1 V
B
12.1 V
C
17.2 V
D
7 V
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