Class 12 CBSE PHYSICS Dual nature of Radiation and Matter
Questions/Sums on Important Concepts Hi students, just 9 days left for CBSE Class 12 Physics Board Exam 2025. So as a ready reckoner, I have given the answers to some of the questions here. For derivations and graphs, please refer your textbook. 1. Why do metals have a large number of electrons? In metals, the electrons in the outermost shells are loosely bound to the nucleus. Thus there are a large number of free electrons moving in a random manner inside the metals at room temperature. 2. Define work function of a metal. The minimum amount of energy required by an electron to just escape from the metal surface. 3. Name the different types of electron emission. Thermionic emission Field emission P hotoelectric emission Secondary emission 4. Draw the graph of effect of intensity of light on photoelectric current. Refer textbook. 5. Define Stopping potential. The value of the retarding p...