Atoms And Nuclei - Modern Physics - Physics Previous Year Questions

A hydrogen atom is ground state absorbs \(10.2 \mathrm{~eV}\) of energy. The orbital angular momentum of the electron is increased by

Frequency of revolution of an electron revolving in \(n\)th orbit of \(\mathrm{H}\)-atom is proportional to

Which one of the following nuclei has shorter mean life?

The end product of decay of \({ }_{90} \mathrm{Th}^{232}\) is \({ }_{82} \mathrm{~Pb}^{208}\). The number of \(\alpha\) and \(\beta\) particles emitted are respectively

In Rutherford experiment, for head-on collision of \(\alpha\)-particles with a gold nucleus, the impact parameter is

Angular momentum of an electron in hydrogen atom is \(\frac{3 h}{2 \pi}\) (\(h\) is the Planck's constant). The KE of the electron is

The period of revolution of an electron revolving in nth orbit of \(\mathrm{H}\)-atom is proportional to

A radio-active elements has half-life of 15 years. What is the fraction that will decay in 30 years?

During a \(\beta^{-}\)-decay

A beam of fast moving alpha particles were directed towards a thin film of gold. The parts \(A, B\) and \(C\) of the transmitted and reflected beams corresponding to the incident parts \(A, B\) and \(C\) of the beam are shown in the adjoining diagram. The number of alpha particles in

Two protons are kept at a separation of \(10 \mathrm{~nm}\). Let \(F_n\) and \(F_e\) the nuclear force and the electromagnetic force between them