1
NEET 2016 Phase 2
+4
-1
Photons with energy 5 eV are incifent on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, no photoelectrons will reach the anode A, if the stopping potential of A relative to C is
A
+ 3 V
B
+4 V
C
$$-$$1 V
D
$$-$$3 V
2
NEET 2016 Phase 1
+4
-1
When a metallic surface is illuminated with radiation of wavelength $$\lambda$$, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2 $$\lambda$$, the stopping potential is $${V \over 4}$$. The threshold wavelength for the metallic surface is
A
$${5 \over 2}\lambda$$
B
3$$\lambda$$
C
4$$\lambda$$
D
5$$\lambda$$
3
NEET 2016 Phase 1
+4
-1
An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is
A
$$c{\left( {2mE} \right)^{{1 \over 2}}}$$
B
$${1 \over c}{\left( {{{2m} \over E}} \right)^{{1 \over 2}}}$$
C
$${1 \over c}{\left( {{E \over {2m}}} \right)^{{1 \over 2}}}$$
D
$${\left( {{E \over {2m}}} \right)^{{1 \over 2}}}$$
4
AIPMT 2015
+4
-1
A photoelectric surface is illuminated successively by monochromatic light of wavelength $$\lambda$$ and If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material is
(h = Planck's constant, C = speed of light)
A
$${{2hc} \over \lambda }$$
B
$${{hc} \over {3\lambda }}$$
C
$${{hc} \over {2\lambda }}$$
D
$${{hc} \over \lambda }$$
EXAM MAP
Medical
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