1
NEET 2013
MCQ (Single Correct Answer)
+4
-1
For photoelectric emission from certain metal the cutoff frequency is $$\upsilon $$. If radiation of frequency 2$$\upsilon $$ impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)
A
$$\sqrt {{{2h\upsilon } \over m}} $$
B
$$2\sqrt {{{h\upsilon } \over m}} $$
C
$$\sqrt {{{h\upsilon } \over {\left( {2m} \right)}}} $$
D
$$\sqrt {{{h\upsilon } \over m}} $$
2
NEET 2013
MCQ (Single Correct Answer)
+4
-1
The wavelength $$\lambda $$e of an electron and $$\lambda $$p of a photon of same energy E are related by
A
$${\lambda _p} \propto \sqrt {{\lambda _e}} $$
B
$${\lambda _p} \propto {1 \over {\sqrt {{\lambda _e}} }}$$
C
$${\lambda _p} \propto {\lambda _e}^2$$
D
$${\lambda _p} \propto {\lambda _e}$$
3
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
4
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
If the momentum of an electron is changed by P, then the de Broglie wavelength associated with changes by 0.5%. The initial momentum of electron will be
A
200 P
B
400 P
C
$${P \over {200}}$$
D
100 P
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