1
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
A diatomic molecule is made of two masses $${m_1}$$ and $${m_2}$$ which are separated by a distance $$r.$$ If we calculate its rotational energy by applying Bohr's rule of angular momentum quantization, its energy will be given by: ($$n$$ is an integer)
A
$${{{{\left( {{m_1} + {m_2}} \right)}^2}{n^2}{h^2}} \over {2m_1^2m_2^2{r^2}}}$$
B
$${{{n^2}{h^2}} \over {2\left( {{m_1} + {m_2}} \right){r^2}}}$$
C
$${{2{n^2}{h^2}} \over {\left( {{m_1} + {m_2}} \right){r^2}}}$$
D
$${{\left( {{m_1} + {m_2}} \right){n^2}{h^2}} \over {2{m_1}{m_2}{r^2}}}$$
2
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
Energy required for the electron excitation in $$L{i^{ + + }}$$ from the first to the third Bohr orbit is :
A
$$36.3$$ $$eV$$
B
$$108.8$$ $$eV$$
C
$$122.4$$ $$eV$$
D
$$12.1$$ $$eV$$
3
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
The half life of a radioactive substance is $$20$$ minutes. The approximate time interval $$\left( {{t_2} - {t_1}} \right)$$ between the time $${{t_2}}$$ when $${2 \over 3}$$ of it had decayed and time $${{t_1}}$$ when $${1 \over 3}$$ of it had decayed is :
A
$$14$$ min
B
$$20$$ min
C
$$28$$ min
D
$$7$$ min
4
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
A nucleus of mass $$M+$$$$\Delta m$$ is at rest and decays into two daughter nuclei of equal mass $${M \over 2}$$ each. Speed of light is $$c.$$

The binding energy per nucleon for the parent nucleus is $${E_1}$$ and that for the daughter nuclei is $${E_2}.$$ Then

A
$${E_2} = 2{E_1}$$
B
$${E_1} > {E_2}$$
C
$${E_2} > {E_1}$$
D
$${E_1} = 2{E_2}$$
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