Calculate the voltage needed to balance on oil drop carrying 10 electron, when located between the plates of capacitor, which are 5 mm apart.Given, mass of drop = `3xx10^(-16)kg`, charge on electron= `1.6xx10^(-19)C` and g = `9.8 m/s^2`.

What is the de Broglie wavelength related to an electron of energy 100 eV ? (Given, mass of electron, m = 9.1 xx 10^(-31) kg, " " e = 1.6 xx 10^(-19) C and h = 6.63 xx 10^(-34) J.s )

Radius of the Bohr orbit of hydrogen atom is 0.53 Å . What will be the velocity of the electron in the second quantum state? Given, mass of electron = 9.1xx10^(-31) kg and e=1.6 xx10^(-19) C .

Under what potential difference should an electron be accelerated to obtain electron waves of lamda = 0.6 Å ? Given, mass of electron, m = 9.1 xx 10^(-31) kg , Planck's constant, h = 6.62 xx 10^(-34) J.s

If an electron is moving with a velocity of 10^(-7)m.s^(-1) at right angles to a magnetic field of strength 10^(-3)T , determine the magnetic force acting on the electron and the radius of the circular path it describes. Given, mass of an electron =9.1xx10^(-31)kg , electronic charge =1.6xx10^(-19)C .

An electron enters a magentic field of 3T at an angle of 30^(@) with a velocity of 10^(6)m.s^(-1) . What force will act on the electron? e=1.6xx10^(-19)C

A metal has a work function of 2eV. It is illuminated by monochromatic light of wavelength 500 nm, calculate (i) the threshold wavelength, (ii) the maximum energy of photoelectrons, (iii) The stopping potential. Given Planck's constant h = 6.6 xx 10^(-34)J.s , charge on electron e = 1.6 xx 10^(-19) C and 1eV = 1.6 xx 10^(-19)J

Calculate the kinetic energy of a moving electron which has a wavelength of 4.8 pm. [mass of electron = 9.11 xx 10^(-31) kg, h = 6.626 xx 10^(-34) Kg m^2s^(-1) ].

A proton and electron have kinetic energy equal to 10^5 eV and 10^4 eV respectively. Which of them moves faster ? Also calculate the ratio of their speeds. Given, mass of electron =9.11xx10^(-31) kg , mass of proton =1.67xx10^(-27) kg and 1eV =1.6xx10^(-19) Joule.

The number of electron delivered at the cathode during electrolysis by a current of 1A in 60s is (charge on electron =1.60xx10^(-19)C )-

Calculate the de Broglie wavelength associated with an electron moving with velocity of 1.0xx10^(7)m//s . (mass of an electron: 9.1xx10^(-31)kg )