Triple Point of a Pure Substance

Definition:- Triple point is define as the state of the pure substance existing as an equilibrium mixture of solid, liquid, vapour phase of that substance so that the state is define by fixed
temperature and pressure.

Zeroth law of thermodynamic

Statement:- If two system is in thermal equilibrium¹ with a third system then the are in thermal equilibrium with each other.

Explanation:- Let tow system A and B are in thermal equilibrium with a third system C i.e.
the all the  thermodynamic parameter of system A and B are exactly same

Thermodynamic Equilibrium Complite Defination

                  What is thermodynamic Equilibrium? 

A system in which the macroscopic property defining the interior state of a system remain unchanged with time is said to be in thermodynamic equilibrium. At thermodynamic equilibrium the system must have to be in
mechanical, chemical and thermal equilibrium.

Failure of Electromagnetic Wave Theory To Describe Photoelectric Effect

According to electromagnetic theory, light is a resultant propagation of electric and magnetic field mutually perpendicular to it and it exert force on an electron continuously. But these rigorous theory of light fail to explain the characteristic of photoelectron emitting

from certain metal surface when a light of certain frequency incident on it.

Photoelectric Effect a brief description

Photoelectric Effect

“I think I can safely say that nobody understands Quantum Mechanic.” – Richard Feynman.

 What is Photoelectric Effect?

      

         When a ray of light (of finite value of frequency or frequencies) incidence on a photosensitive metal ( Na, K, Cs etc. ) sheet , then electron emanate from the sheet. T phenomena of emission of electron from such a metal sheet is