AIPMT 2008 | Atoms and Nuclei Question 79 | Physics

Two radioactive materials X₁ and X₂ have decay constants $$5\lambda $$ and $$\lambda $$ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X₁ to that X₂ will be 1/e after a time

1/4$$\lambda $$

e/$$\lambda $$

$$\lambda $$

$${1 \over 2}\lambda $$

AIPMT 2008

MCQ (Single Correct Answer)

-1

The ground state energy of hydrogen atom is $$-$$ 13.6 eV. When its electron is in the first excited state, its excitation energy is

10.2 eV

3.4 eV

6.8 eV

AIPMT 2008

MCQ (Single Correct Answer)

-1

Out of Syllabus

Two nuclei have their mass numbers in the ratio of 1 : 3. The ratio of their nuclear densities would be

$${\left( 3 \right)^{1/3}}:1$$

1 : 1

1 : 3

3 : 1

AIPMT 2007

MCQ (Single Correct Answer)

-1

The total energy of electron in the ground state of hydrogen atom is $$-$$ 13.6 eV. The kinetic energy of an electron in the first excited state is

6.8 eV

13.6 eV

1.7 eV

3.4 eV.

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