Free neutron changes into proton with the emission of__________________?
A. Neutrino B. Electron C. Both A & B D. Meson
Chemistry MCQs
Charge of electron was measured by__________________?
A. J.J Thomson B. Millikan C. Rutherford D. Perrin
Rutherford bombarded _________________ particles in discovery of nucleus?
A. Gamma-rays B. Alpha-rays C. Beta-rays D. X-rays
Pfund series are produced in the spectrum of hydrogen atom__________________?
A. when electrons jump down to 2nd- orbit B. when electrons jump down to 3rd- orbit C. when electrons jump down to 4th- orbit D. when electrons jump down to 5th- orbit
Sommerfelds modification in Bohrs model is_______________?
A. Orbit is cylindrical B. Orbit is elliptical C. Orbit is longitudinal D. Orbit is asymmetrical
Wavelength of electron was verified by_________________?
A. Moseley B. Davisson and Germer C. Einstein D. Roentgen
Quantum number which tells the energy of electron is________________?
A. n B. 1 C. m D. s
_______________ can expel proteons from paraffins ?
A. Electron B. Positron C. Neutron D. None of above has such capability
Centrifugal forces are balanced in atom by__________________?
A. Attractive forces B. Repulsive force C. Electrons D. Neutrons