An Electron is revolving around nucleus of charge Ze, if 40.8 eV of energy needed to excite an electron from n=1 to n=2 state. What is value of Z?

${O^{ + + }},{C^ + },H{e^{ + + }}$ and ${H^ + }$ ions are projected on the photographic plate with same velocity in a mass spectrograph. Which one will strike farthest

In hydrogen atom, the electron is moving round the nucleus with velocity $2.18 imes {10^6}\;{\rm{m}}{{\rm{s}}^{ - 1}}$ in an orbit of radius $0.528\;{A^0}$. The acceleration of the electron is

Every series of hydrogen spectrum has an upper and lower limit in wavelength. The spectral series which has an upper limit of wavelength equal to $18752\,\,{A^0}$ is

(Rydberg constant $R = 1.097\,\, imes \,\,{10^7}per\,{\rm{ }}metre$

The angular momentum of electron in ${n^{{\rm{th}}}}$ orbit is given by

If the wavelength of the first line of the Balmer series of hydrogen is $6561 \, \mathop {ext{A}}\limits^ \circ ,$ the wavelength of the second line of the series should be

An Electron is revolving around nucleus of charge Ze, if 40.8 eV of energy needed to excite an electron from n=1 to n=2 state. What is value of Z?

In hydrogen atom, if the difference in the energy of the electron in $n = 2$ and $n = 3$ orbits is $E$, the ionization energy of hydrogen atom is

Taking Rydberg’s constant ${R_H} = 1.097\,\, imes \,\,{10^7}\,\,m$, first and second wavelength of Balmer series in hydrogen spectrum is

First Bohr radius of an atom with $Z = 82$ is $R$. Radius of its third orbit is

In hydrogen atom, the electron is moving round the nucleus with velocity $2.18 imes {10^6}\;{\rm{m}}{{\rm{s}}^{ - 1}}$ in an orbit of radius $0.528\;{A^0}$. The acceleration of the electron is