1
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
2
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
3
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of maximum speeds of emitted electrons will be
A
1 : 4
B
1 : 2
C
1 : 1
D
1 : 5
4
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
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