Atoms and Nuclei · Physics · KCET

In the Rutherford's alpha scattering experiment, as the impact parameter increases, the scattering angle of the alpha particle

Three energy levels of hydrogen atom and the corresponding wavelength of the emitted radiation due to different electron transition are as shown. Then...

A radioactive sample has half-life of 3 years. The time required for the activity of the sample to reduce to $$\frac{1}{5}$$th of its initial value is...

In the following equation representing $$\beta^{-}$$ decay, the number of neutrons in the nucleus $$X$$ is $${ }_{83}^{210} \mathrm{Bi} \longrightarro...

A nucleus with mass number 220 initially at rest emits an alpha particle. If the $$Q$$ value of reaction is $$5.5 ~\mathrm{MeV}$$. Calculate the value...

The radius of hydrogen atom in the ground state is 0.53$$\mathop A\limits^o $$. After collision with an electron, it is found to have a radius of 2.12...

In accordance with the Bohr's model, the quantum number that characterises the Earth's revolution around the Sun in an orbit of radius $$1.5 \times 10...

If an electron is revolving in its Bohr orbit having Bohr radius of 0.529$$\mathop A\limits^o $$, then the radius of third orbit is

Binding energy of a nitrogen nucleus $$\left[{ }_7^{14} \mathrm{~N}\right]$$, given $$m\left[{ }_7^{14} \mathrm{~N}\right]=14.00307 \mathrm{u}$$...

Which of the following radiations is deflected by electric field?

A nuclear reactor delivers a power of $$10^9 \mathrm{~W}$$, the amount of fuel consumed by the reactor in one hour is

Energy of an electron in the second orbit of hydrogen atom is $$E_2$$. The energy of electron in the third orbit of $$\mathrm{He}^{+}$$ will be

The figure shows standing de-Broglie waves due to the revolution of electron in a certain orbit of hydrogen atom. Then, the expression for the orbit r...

An electron in an excited state of $$\mathrm{Li}^{2+}$$ ion has angular momentum $$\frac{3 h}{2 \pi}$$. The de-Broglie wavelength of electron in this ...

Which graph in the following diagram correctly represents the potential energy of a pair of nucleons as a function of their separation?

In a nuclear reactor heavy nuclei is not used as moderators because

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

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

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 c...

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...

During a $$\beta^{-}$$-decay

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

Which one of the following nuclei has shorter mean life? ...

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

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

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

The end product of decay of $${ }_{90} \mathrm{Th}^{232}$$ is $${ }_{82} \mathrm{~Pb}^{208}$$. The number of $$\alpha$$ and $$\beta$$ particles emitte...