Explain qualitatively that an e.m. wave can propagate without material medium.

State two properties of e.m wave.

Will two waves differing in amplitude only and propagating in opposite direction through a medium produce standing waves?

Can momentum of a system be changed without changing its K.E.?

Explain why wave theory can't explain photoelectric effect.

Explain why radio waves can not produce photoelectrons from metals, while ultraviolet rays can.

Explain the physical proces on the basis of which the r.m.s value of AC is defined? Derive the expression for r.m.s value of an alternating voltage. How does the value of Capacitative voltage. How does the value of Capacitative reactance of a capacitor change with the frequecny of the applied alternating e.m.f across it.