Which scientist gave plum pudding model of the atom ?
If in Rutherford’s experiment, the number of particles scattered at ${90^o}$ angle are $28$ per min, then number of scattered particles at an angle ${60^o}$ and ${120^o}$ will be
The ratio of ionization energy of Bohr's hydrogen atom and Bohr's hydrogen like lithium atom is
Ratio of longest wave lengths corresponding to Lyman and Balmer series in hydrogen spectrum is
For a certain hypothetical one electron atom the wavelength (in $Å$ ) for the spectral lines for transition from $n = p$ to $n = 1$ are given by $\lambda = \frac{{1500{p^2}}}{{{p^2} - 1}}$ (where $p > 1$ ), then the ionization potential of this element must be ......$V$ (Take $hc = 12420\ eV-Å$ )
According to the classical electromagnetic theory, calculate the initial frequency of the light emitted by the electron revolving around a proton in hydrogen atom.