1
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
2
AIPMT 2010 Mains
MCQ (Single Correct Answer)
+4
-1
When monochromatic radiation of intensity $$I$$ falls on a metal surface, the number of photoelectrons and their maximum kinetic energy are N and T respectively. If the intensity of radiation is 2$$I$$, the number of emitted electrons and their maximum kinetic energy are respectively
A
N and 2T
B
2N and T
C
2N and 2T
D
N and T
3
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
4
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
A source S1 is producing, 1015 photons per second of wavelength 5000 $$\mathop A\limits^ \circ $$. Another source S2 is producing 1.02 $$ \times $$ 1015 photons per second of wavelength 5100 $$\mathop A\limits^ \circ $$. Then, (power of S2)/(power of S1) is equal to
A
1.00
B
1.02
C
1.04
D
0.98
NEET Subjects
EXAM MAP