Considering the wavelengths of electron and proton to be equal, then the ratio of their velocities `((v_(e))/(v_(p)))` would be....
(mass of electron `=9.1times10^(-31)`) (mass of proton `=1.67times10^(-27)kg` )

When would the wavelength associated with an electron become equal to that with proton ? (Mass of electron = 9.10 xx 10^(-31) kg , Mass of proton =1.6725 xx 10^(-27)kg )

Determine the de Broglie wavelength of a proton, whose kinetice energy is equal to the rest of the mass energy of an electron. Given that the mass of an electron is 9xx10^(-31) kg and the mass of a proton is 1837 times as that of the electron.

The ratio of electrostatic and gravitational force acting between electron and proton separated by a distance 5 xx 10^(-11)m , will be (charge on electron = 1.6 xx 10^(-19)C , mass of electron = 9.1 xx 10^(-31) kg , mass of proton = 1.6 xx 10^(-27) kg, G = 6.7 xx 10^(-11) N - m^(2)//kg^(2) )

An electron and a proton are detected in a cosmic ray experiment, the first with kinetic energy 10 keV, and the second with 100 keV. Which is faster, the electron or the proton ? Obtain the ratio of their speeds. (Electron mass =9.11xx10^(-31) kg , proton mass =1.67xx10^(-27) kg, 1 eV=1.60xx10^(-19) J) .

Molar mass of electron is nearly : (N_(A) = 6 xx 10^(23)) , mass of e^(-) = 9.1 xx 10^(-31)Kg

The force between two electrons when placed in air is equal to 0.5 times the weight of an electron. Find the distance between two electrons (mass of electron = 9.1 xx 10^(-31)kg )

Assume that a neutron breaks into a proton and an electron . The energy reased during this process is (mass of neutron = 1.6725 xx 10^(-27) kg mass of proton = 1.6725 xx 10^(-27) kg mass of electron = 9 xx 10^(-31) kg )

Electron are accelerated through a potential difference V and protons are accelerated through a potential difference of 4 V. The de-Broglie wavelength are lamda_e and lamda_p for electrons and protons, respectively The ratio of lamda_e/lamda_p is given by ( given , m_e is mass of electron and m_p is mass of proton )

In the Bohr model of hydrogen atom, the electron is treated as a particle going in a circle with the centre at the proton. The proton itself is assumed to be fixed in an inertial frame. The centripetal force is provided by the Coloumb attraction. In the ground state, the electron goes round the proton in a circle of radius 5.3xx10^-11m . Find the speed of the electron in the ground state. Mass of the electron =9.1xx10^-31 kg and charge of the electron = 1.6xx10^-19C .

Find (a) the total number and (b) the total mass of protons in 34 mg of NH_(3) at S.T.P. (Assume the mass of proton =1.6726xx10^(-27)kg )