AIEEE 2003 | Atoms and Nuclei Question 247 | Physics

If the binding energy of the electron in a hydrogen atom is $$13.6eV,$$ the energy required to remove the electron from the first excited state of $$L{i^{ + + }}$$ is

$$30.6$$ $$eV$$

$$13.6$$ $$eV$$

$$3.4$$ $$eV$$

$$122.4$$ $$eV$$

AIEEE 2003

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which of the following cannot be emitted by radioactive substances during their decay ?

Protons

Neutrinoes

Helium nuclei

Electrons

AIEEE 2003

MCQ (Single Correct Answer)

-1

Which of the following atoms has the lowest ionization potential ?

$${}_7^{14}N$$

$${}_{55}^{133}\,Cs$$

$${}_{18}^{40}\,Ar$$

$${}_8^{16}\,O$$

AIEEE 2003

MCQ (Single Correct Answer)

-1

In the nuclear fusion reaction $$${}_1^2H + {}_1^3H \to {}_2^4He + n$$$
given that the repulsive potential energy between the two nuclei is $$ \sim 7.7 \times {10^{ - 14}}J$$, the temperature at which the gases must be heated to initiate the reaction is nearly
[ Boltzmann's Constant $$k = 1.38 \times {10^{ - 23}}\,J/K$$ ]

$${10^7}\,\,K$$

$${10^5}\,\,K$$

$${10^3}\,\,K$$

$${10^9}\,\,K$$

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