AIEEE 2012 | Atoms and Nuclei Question 214 | Physics

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)

$${{{{\left( {{m_1} + {m_2}} \right)}^2}{n^2}{h^2}} \over {2m_1^2m_2^2{r^2}}}$$

$${{{n^2}{h^2}} \over {2\left( {{m_1} + {m_2}} \right){r^2}}}$$

$${{2{n^2}{h^2}} \over {\left( {{m_1} + {m_2}} \right){r^2}}}$$

$${{\left( {{m_1} + {m_2}} \right){n^2}{h^2}} \over {2{m_1}{m_2}{r^2}}}$$

AIEEE 2012

MCQ (Single Correct Answer)

-1

Hydrogen atom is excited from ground state to another state with principal quantum number equal to $$4.$$ Then the number of spectral lines in the emission spectra will be :

$$2$$

$$3$$

$$5$$

$$6$$

AIEEE 2011

MCQ (Single Correct Answer)

-1

Energy required for the electron excitation in $$L{i^{ + + }}$$ from the first to the third Bohr orbit is :

$$36.3$$ $$eV$$

$$108.8$$ $$eV$$

$$122.4$$ $$eV$$

$$12.1$$ $$eV$$

AIEEE 2011

MCQ (Single Correct Answer)

-1

Out of Syllabus

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 :

$$14$$ min

$$20$$ min

$$28$$ min

$$7$$ min

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