Photon Flux

A point source is emitting 0.2 W of ultravio- let radiation at a wavelength of lambda = 2537 Å . This source is placed at a distance of 1.0 m from the cathode of a photoelectric cell. The cathode is made of potassium (Work function = 2.22 eV ) and has a surface area of 4 cm^(2) . (a) According to classical theory, what time of exposure to the radiation shall be required for a potassium atom to accumulate sufficient energy to eject a photoelectron. Assume that radius of each potassium atom is 2 Å and it absorbs all energy incident on it. (b) Photon flux is defined as number of light photons reaching the cathode in unit time. Calculate the photon flux. (c) Photo efficiency is defined as probability of a photon being successful in knocking out an electron from the metal surface. Calculate the saturation photocurrent in the cell assuming a photo efficiency of 0.1. (d) Find the cut – off potential difference for the cell.

Photons

Photons are

Photon is not a..........but it is a.......... .

Calculation OF Flux || Calculation OF Flux in Non Uniform Electric Field

Calculation OF flux

In a hydrogen like sample two different types of photons A and B are produced by electronic transition. Photon B has its wavelength in infrared region. If photon A has more energy than B, then the photon may belong to the region:

Assertion Magnetic flux and the electric flux have the same units. Reason Flux passing throught a surface gives an idea about the field lines crossing that surface

A photon of light of wavelength 6000 overset@A has energy E. What will be the wavelength of photon of a light which has energy of photon 4E?