क्या किसी कण पर `1.6 xx 10^(-20)` कॉलम आवेश हो सकता है? `2.4 xx 10^(-19)` कॉलम, 16 कॉलम?

The photoelectric threshold wavelength for Potassium having work function of 2eV is.......... (Take h= 6.6 xx 10^(-34) J s. 1 eV = 1.6 xx 10^(-19) J , C = 3 xx 10^8 Ms^(-1) )

The value of charge on the oil droplets experimentally observed were -1.6 xx 10^(-19), - 2.4 xx 10^(-19) and - 4xx10^(-19) C. The value of electronic charge, indicated by these results is (1) -1.6 xx 10^(-19) (2) -2.4 xx 10^(-19) (3) -4 xx 10^(-19) (4) - 0.8 xx 10^(-19)

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) )

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) )

Light of wavelength 4000 Å falls on a photosensitive metal and a negative 2 V potential stops the emitted electrons. The work function of the material ( in eV) is approximately ( h = 6.6 xx 10^(-34) Js , e = 1.6 xx 10^(-19) C , c = 3 xx 10^(8) ms^(-1))

In a cyclotron protons are to be accelerated. Radius of the D is 60 cm and its oscillator frequency is 10 Mhz. What will be the kinetic energy of the accelerated proton? Proton mass = 1.67 xx 10^-27 kg , e = 1.6 xx 10^-19C lev = 1.6 xx 10^-19 J