Describe Milikan's oil drop experiment to determine the charge of an electron.

Describe Davisson and Germer experiment to establish the wave nature of electron. Draw labelled diagram of the apparatus used.

In Millikan’s oil drop experiment, what is the terminal speed of an uncharged drop of radius 2.0 xx 10^-5m and density 1.2 xx 10^3 kg m^-3 ? Take the viscosity of air at the temperature of the experiment to be 1.8 xx 10^-5 Pa s. How much is the viscous force on the drop at that speed? Neglect buoyancy of the drop due to air.

What is the value of charge on an electron?

Describe Young's double slit experiment and determine the conditions for obtaining bright and dark fringes.

How is the mass of an electron determined?

Describe an experiment to show that water movement occurs through xylem.