List of top Physics Questions on Atoms asked in KCET

Frequency of revolution of an electron revolving in nth orbit of H-atom is proportional to

Spectrum of sunlight is an example for

Flash spectrum confirms a/an

$\upsilon_{1}$ is the frequency of the series limit of Lyman series, $\upsilon_{2}$ is the frequency of the first line of Lyman series and $\upsilon_{3}$ is the frequency of the series limit of the Balmer series. Then

An electron is moving in an orbit of a hydrogen atom from which there can be a maximum of six transitions. An electron is moving in an orbit of another hydrogen atom from which there can be a maximum of three transitions. The ratio of the velocity of the electron in these two orbits is

Hydrogen atom from excited state comes to the ground state by emitting a photon of wavelength $\lambda$. If $R$ is the Rydberg constant, the principal quantum number $'n'$ of the excited state is

In ruby laser, the stimulated emission is due to transition from

Continuous emission spectrum is produced by

Hydrogen atom does not emit $X-rays$ because

The masses of two radioactive substances are same and their half lives are $1$ year and $2$ years respectively. The ratio of their activities after 6 years will be

In Raman effect, Stoke's lines are spectral lines having

If $\lambda_{1}$ and $\lambda_{2}$ are the wavelengths of the first members of the Lyman and Paschen series respectively, then $\lambda_{1}: \lambda_{2}$ is

If $r_1$, and $r_2$ are the radii of the atomic nuclei of mass numbers $64$ and $125$ respectively, then the ratio ($r_1/r_2$) is

The SI unit of radioactivity is

In nuclear fission the percentage of mass converted into energy is about

In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life ?

Radio waves and visible light in vacuum have

After an interval on one day ${1/6}^{th}$ of the initial amount of a radioactive material remains in a sample. Then its half life is

An atom of mass number A and atomic number Z emits successively an $\alpha$-particle, a $\beta$-particle and a $\gamma$-ray. The mass number and atomic number of the end product are

In the Nuclear reaction given below : $_7N^{14}+2He^4\rightarrow\,X+_1H^1$, the nucleus X is

Ionisation energy of hydrogen atom is 13.6 eV. Then the energy required to ionise a hydrogen atom in which the electron is in the second orbit from the nucleus is (eV)

If $E_p$ and $E_k$ are the potential energy and kinetic energy of the electron in a stationary orbit in the hydrogen atom, the value of $E_p/E_k$ is

Fertile material among the following is

Frequency of the series limit of Balmer series of hydrogen atom in terms of Rydberg constant $R$ and velocity of light $c$ is

In terms of Rydberg constant R, the shortest wavelength in Balmer series of hydrogen atom spectrum will have wavelength