Atomic Physics

Some energy levels of a molecule are shown in the figure. The ratio of the wavelengths $r=\frac{\lambda\,_{1}}{\lambda\,_{2}}$, is given by:

The energy levels of an atom is shown is figure. Which one of these transitions will result in the emission of a photon of wavelength $124.1\mathrm{nm}$? Given ($h=6.62\times\,10^{-34}Js$)

If Rydberg's constant is $R$, the longest wavelength of radiation in Paschen series will be $\frac{\alpha\,}{7R}$,where$\alpha\,=$______.

An electron in the hydrogen atom initially in the fourth excited state makes a transition to $\mathrm{n}^{\text {th }}$ energy state by emitting a photon of energy 2.86 eV. The integer value of $n$ will be ____?

The radius of$2^{\mathrm{nd}}$orbit of$\mathrm{He}^{+}$of Bohr's model is$r_{1}$and that of fourth orbit of$\mathrm{Be}^{3+}$is represented as$r_{2}.$Now the ratio$\frac{r_{2}}{r_{1}}$is$x:1.$The value of$x$is _____?

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The Bohr model is applicable to hydrogen and hydrogen-like atoms only. Reason R : The formulation of…

The mass defect in a particular reaction is $0.4g$. The amount of energy liberated is$n\times\,10^{7}\mathrm{kW}h$,where $n=$ _____. (speed of light$=3\times\,10^{8}ms^{-1}$)

$X$ different wavelength may be observed in the spectrum from a hydrogen sample if the atoms are excited to states with principal quantum number $n=6$? The value of $X$ is

$\frac{x}{x+4}$ is the ratio of energies of photons produced due to transition of an electron of hydrogen atom from its (i) third permitted energy level to the second level and (ii) the highest permitted energy level to…

A beam of monochromatic light is used to excite the electron in $\mathrm{Li}^{++}$from the first orbit to the third orbit. The wavelength of monochromatic light is found to be $x\times\,10^{-10}m$. The value of $x$ is…

A hydrogen atom changes its state from $n=3$ to $n=2$. Due to recoil, the percentage change in the wave length of emitted light is approximately $1 \times 10^{-n}$. The value of $n$ is_____. [Given $\mathrm{Rhc}=13.6…

The radius of fifth orbit of$\mathrm{Li}^{++}$is$\mathrm{_______}\times\,10^{-12}m.$Take: radius of hydrogen atom$=0.51\overset{\circ\,}{A}$