Ay1990anita

Class 11 Physics – Chapter 1: Units and Measurements (Short Notes) • Physical Quantity: A measurable quantity such as length, mass, and time. • Unit: A standard used to measure a physical quantity. • SI Base Units: - Length – metre (m) - Mass – kilogram (kg) - Time – second (s) - Electric Current – ampere (A) - Temperature – kelvin (K) - Amount of Substance – mole (mol) - Luminous Intensity – candela (cd) • Derived Units: - Speed = m/s - Force = n...