Would the Bohr formula for the H-atom remian unchanged if proton had a charge `(+4//3)e` and electron a charge `(-3//4)e`, where `e=1.6xx10^-19C`. Give reasons for your answer.

An atom of element E contains 3 protons, 3 electrons and 4 neutrons : What could element E be

An atom of element E contains 3 protons, 3 electrons and 4 neutrons : (a) What is its atomic number ?

Calculate the magnitude of the electrostatic force exerted by the proton on the electron in the hydrogen atom and compare it with the weight of the electron. Given that mass of electron is 9.1 xx 10^-31 kg, charge on electron is 1.6 xx 10^-19 C and radius of hydrogen atom is 0.53 overset(@)A .

The mass to charge ratio (m//e) for a cation is 1.5xx10^(-8) kg//C. What is the mass of this cation?

If the free electron density of copper is 8.6xx10^(28)m^(-3) and resistivity of copper at room temperature is 1.7xx10^(-6)Omega cm , find the relaxation time for the free electrons of copper. Given, mass of electron =9.1xx10^(-31) kg , and charge of electron =1.6xx10^(-19)C. Boltzmann's constant k = 1.38 xx 10^-23 J K^-1

The procedure in was repeated for three further oil droplets. The magnitude of the charge on each of the droplets was found to be 3.2 xx 10^-19C, 6.4 xx 10^-19C and 3.2 xx 10^-19C . Explain what value these data and your answer in would guggest for the charge on the electron.

A current of 2.4 A flows through a wire of cross-sectional area 1.5 mm^2 . Find the current density in the wire. If the wire contains 8 xx 10^28m^-3 elecrtrons per unit volume calculate the average relaxation on time. Given that charge on electron = 1.6 xx 10^-19C and mass of electron =9.1 xx 10^-31 kg.

Obtain de-Broglie waveelngth of an electon of kinetic energy 150 eV.Given mass of electron, m=9.1 xx 10^(-31) kg ,charge on electron, e=1.6 xx 10^(-19) C and Planck's constant , h=6.62 xx 10^(-34) J s .