1
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
Ratio of longest wave lengths corresponding to Lyman and Balmer series in hydrogen spectrum is
A
$${7 \over {29}}$$
B
$${9 \over {31}}$$
C
$${5 \over {27}}$$
D
$${3 \over {23}}$$
2
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
A wire of resistance 4 $$\Omega $$ is stretched to twice its original length. The resistance of stretched wire would be
A
8 $$\Omega $$
B
16 $$\Omega $$
C
2 $$\Omega $$
D
4 $$\Omega $$
3
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
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
$$\sqrt {{{h\upsilon } \over m}} $$
4
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
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
$${\lambda _p} \propto {\lambda _e}$$