Show that the energy density of em radiation is `epsilon_0E^2`. Hence, find the intensity of radiations?

About 5% of the power of a 100 W light bulb is converted to visible radiation. What is the average intensity of visible radiation at a distance of 10 m? Assume that the radiation is emitted isotropically and neglect reflection.

State the influence of work function on kinetic energy of electrons emitted in a photocell. If the intensity of the incident radiation is doubled, what changes occur in the stopping potential and photoelectric current?

State the dependence of work function on kinetic energy of electrons emitted in a photocell. If the intensity of the incident radiation is doubled, what changes occur in the stopping potential and photoelectric current?

In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of 2.0 xx 10^10 Hz and amplitude 48 V m^-1 . Show that the average energy density of the E field equals the average energy density of the B field, [c = 3 xx 10^8 m s^-1 .]

Show that the wavelength of electromagnetic radiation is equal to the de-Broglie wavelength of its quantum (Photon).

Define the term threshold frequency and stopping potential in relation to phenomenon of photoelectric effect. How is the photoelectric current affected on increasing the intensity of incident radiation and why?

What is common between different types of e.m. radiation?

About 5% of the power of a 100 W light bulb is converted to visible radiation. What is the average intensity of visible radiation at a distance of lm from the bulb? Assume that the radiation is emitted isotropically and neglect reflection.

Wavelength of e.m.radiation is tripled. What will happen to its energy?