JEE Main Atoms and Nuclei Practice Questions With Solutions

A nucleus at rest disintegrates into two smaller nuclei with their masses in the ratio of $2:1$2 : 1. After disintegration they will move :

The energy released in the fusion of $2\mathrm{kg}$2 \textrm{ } kg of hydrogen deep in the sun is $E_H$E_{H} and the energy released in the fission of $2\mathrm{kg}$2 \textrm{ } kg of ${}^{235}\mathrm{U}$^{235} U is $E_U$E_{U}. The ratio $\frac{E_H}{E_U}$\frac{E_{H}}{E_{U}} is approximately:(Consider the fusion reaction as $4_1^{1}H+2{\mathrm{e}}^{-}\to {}_2^4\mathrm{He}+2v+6\gamma +26.7\mathrm{MeV}$4_{1}^{1} H + 2 e^{-} \rightarrow _{2}^{4} He + 2 v + 6 \gamma + 26.7 \textrm{ } MeV, energy released in the fission reaction of ${}^{235}\mathrm{U}$^{235} U is $200\mathrm{MeV}$200 \textrm{ } MeV per fission nucleus and ${\mathrm{N}}_{\mathrm{A}}=6.023\times {10}^{23})$N_{A} = 6.023 \times 10^{23} \left.\right)

A hydrogen atom in ground state is given an energy of $10.2\mathrm{eV}$10.2 \textrm{ } eV. How many spectral lines will be emitted due to transition of electrons?

The energy equivalent of $1\mathrm{g}$1 \textrm{ } g of substance is :

If $M_0$M_{0} is the mass of isotope ${}_5^{12}B,M_p$_{5}^{12} B , M_{p} and $M_n$M_{n} are the masses of proton and neutron, then nuclear binding energy of isotope is:

In a hypothetical fission reaction

${}_{92}{X}^{236}\to {}_{56}{\mathrm{Y}}^{141}+{}_{36}{Z}^{92}+3R$_{92} X^{236} \rightarrow _{56} Y^{141} + _{36} Z^{92} + 3 R

The identity of emitted particles (R) is :

Binding energy of a certain nucleus is $18\times {10}^8\mathrm{J}$18 \times 10^{8} \textrm{ } J. How much is the difference between total mass of all the nucleons and nuclear mass of the given nucleus:

The longest wavelength associated with Paschen series is : (Given ${\mathrm{R}}_{\mathrm{H}}=1.097\times {10}^7\mathrm{SI}$R_{H} = 1.097 \times 10^{7} SI unit)

The ratio of the shortest wavelength of Balmer series to the shortest wavelength of Lyman series for hydrogen atom is :

The angular momentum of an electron in a hydrogen atom is proportional to : (Where $\mathrm{r}$r is the radius of orbit of electron)