The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?
A
Curves (a) and (b) represent incident radiations of same frequency but of different intensities.
B
Curves (b) and (c) represent incident radiations of different frquencies and different intensities.
C
Curves (b) and (C) represent incident radiations of same frequency having same intensity.
D
Curves (a) and (b) represent incident radiations of different frequencies and different intensities
2
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the
A
infrared region
B
X-ray region
C
Ultraviolet region
D
Visible region
3
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 $$ \times $$ 106 m s$$-$$1. The velocity of the particle is
A
3 $$ \times $$ 10$$-$$31 ms$$-$$1
B
$$2.7 \times {10^{ - 21}}\,m{s^{ - 1}}$$
C
2.7 $$ \times $$ 10$$-$$18 ms$$-$$1
D
9 $$ \times $$ 10$$-$$2 ms$$-$$1
4
AIPMT 2008
MCQ (Single Correct Answer)
+4
-1
In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of
A
collisions between the charged particles emitted from the cathode and the atoms of the gas
B
collision between different electrons of the atoms of the gas
