Question

Respond to the following: Describe photoelectric effect and give examples. In your own words, explain the Bohr model and line spectra. In your own words, explain laser and X-Ray production.

Answer 1

Photoelectric effect is a phenomenon in which light can be used to push electrons , freeing them from the surface of a solid. This is also called as photo emission. It was discovered by henrich herrz thus it is also known as hertz effects. Each particle of light called photon collides with an electron and uses some of the energy to free the elctron. Remaining energy transfers to the free negative charge called tge photo electron.

Example:

Q) If photons of wavelength 0.1nm are incident on a 2m x 2m Solar Panel at a rate of 2.51x10^15s^-1, calculate the intensity, I, of the photons on the Solar Panel.
Ans ) If wavelength = 0.1nm, (as E=hc/λ), the energy provided by each photon, E= 1.99x1015 J .Therefore, if they hit the panel at a rate of 2.51x1015s-1, Power = Energy x Rate, =4.99W Intensity, I = Power / Area, = 4.99W/(2m x2m)Therefore, I=1.25Wm-2