Embibe Experts Solutions for Chapter: Atomic Physics, Exercise 5: Exercise (Analytical Questions)

The ionisation energies of K-shell for cobalt, copper, and molebdenum are 7.8, 9.0 and 20.1 keV respectively. If any metal out of these is used as target in an X-ray tube operated at 15 KV, then:-

The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation :-
(a)    the intensity increases

(b)    the minimum wavelength increases

(c)    the intensity remains unchanged

(d)    the minimum wavelength decreases

In producing X-rays a beam of electrons accelerated by a potential difference V is made to strike a metal target. For what value of V of the following X-rays have the lowest wavelength of 0.3094 angstrom.

Energy levels of a certain atom corresponding to increasing values of energy are such that $E_{\mathrm{A}}<E_{\mathrm{B}}<E_{\mathrm{C}}.$ If ${\lambda }_1,{\lambda }_2,{\lambda }_3$are the
wavelengths of radiations corresponding to the transitions $\mathrm{C}$ to  $\mathrm{B},\mathrm{B}$ to $\mathrm{A}$ and  $\mathrm{C}$ to $\mathrm{A}$ respectively, which of the following statements is correct?

What is the approximate ratio of wavelength of radiation ${\mathrm{K}}_{{\mathrm{\alpha }}_1}={\mathrm{K}}_{{\mathrm{\alpha }}_2}$ when atomic number of first target is Z₁ = 64 and atomic number of second target is Z₂ = 80 :-
 

The ionization potential of the hydrogen atom is 13.6 V. The energy needed to ionize a hydrogen atom which is in its first excited state is about

Ionization potential of hydrogen is 13.6 volt. If it is excited by a photon of energy 12.1 eV, then the number of lines in the emission spectrum will be 

The electron of a hydrogen atom revovles round the proton in a circular n^th orbit of radius $r_n=\frac{{\epsilon }_0{n}^2{h}^2}{\left(\pi m{e}^2\right)}$ with a speed ${\upsilon }_n=\frac{e^2}{2{\epsilon }_{0}nh}$. The current due to the circulating charge is proportional to