1
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
Two radiations of photons energies 1 eV and 2.5 eV, successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is
A
1 : 4
B
1 : 2
C
1 : 1
D
1 : 5
2
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
A 200 W sodium street lamp emits yellow light of wavelength 0.6 $$\mu $$m. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is
A
1.5 $$ \times $$ 1020
B
6 $$ \times $$ 1018
C
62 $$ \times $$ 1020
D
3 $$ \times $$ 1019
3
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. The threshold frequency of the material is
A
4 $$ \times $$ 1015 Hz
B
5 $$ \times $$ 1015 Hz
C
1.6 $$ \times $$ 1015 Hz
D
2.5 $$ \times $$ 1015 Hz
4
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
An $$\alpha $$-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 Wb/m2. The de Broglie wavelength associated with the particle will be
A
1 $$\mathop A\limits^ \circ $$
B
0.1 $$\mathop A\limits^ \circ $$
C
10 $$\mathop A\limits^ \circ $$
D
0.01 $$\mathop A\limits^ \circ $$
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