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Posted by Bhupesh sahu on April 21, 2023

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Posted by Bhupesh sahu on April 08, 2020

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Black body Radiation: Every body emits energy in the form of wave due to its temperature these radiation are known as Thermal radiation . -A perfectly blackbody is one which absorbed heat radiation of all wavelength incident on it. -It neither reflects nor transmits any of the incident radiation and therefore,appears black. - When a black body is heated its emits radiation which are known as black body radiation.

Photoelectric effect

Photoelectric effect: when light is incident on a metal surface then electrons are emitted from it. This phenomena is called photoelectric effect.The emitted electrons are called photoelectrons. Laws of photoelectric emissions : 1. The emission of photo-electrons takes place only when the frequency of incident radiation is above certain critical value of that metal.This critical value is called threshold frequency . 2 . The emission of photo-electrons starts as soon as the light falls on metal surface i.e.the photoelectric emission is instantaneous. 3 . The maximum kinetic energy with which the photo-electrons are emitted from a metal surface is independent of the intensity of the light and only depends upon the frequency. 4 . For a given frequency, the number of photo-electrons emitted is directly proportional to the intensity of incident light . 5 .The energy distribution of the photo-electron is independent of the intensity of the incident light. Experimental st

DE-BROGLIE WAVELENGTH

I) In term of energy:- Kinetic energy of a potential of mass m moving with velocity v is given by Where p is momentum of particles Therefore, We knowing that de- Broglie wavelength λ= h/p Therefore, ........................(1) II) In term of temperature:- From kinetic energy of gases, the average kinetic energy of a material particles at temperature T is given by Where k is Boltzmann constant. The value of k= 1.38 x 10^-23 J/k Putting this value in eq (1), we get Therefore, ...................(2)

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