Units and Measurements
Maharashtra Board · Class 11 · Physics
Quick revision notes for Units and Measurements — Maharashtra Board Class 11 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
1. Introduction to Units and Measurements
- Physics is a quantitative science requiring precise measurements
- Every measurement involves comparison with a standard unit
- A unit is the standard measure of any physical quantity
2. Systems of Units
- CGS: Centimetre-Gram-Second system
- MKS: Metre-Kilogram-Second system
- FPS: Foot-Pound-Second system
3. Fundamental and Derived Quantities
- Seven fundamental quantities: Length(m), Mass(kg), Time(s), Temperature(K), Electric current(A), Luminous intensity(cd), Amount of substance(mol)
- Fundamental quantities are independent of other quantities
- Derived quantities depend on fundamental quantities
4. Measurement of Length
- Metre defined as distance travelled by light in vacuum in 1/299,792,458 second
- Range: 10⁻¹⁵ m (nuclear size) to 10²² m (galactic distances)
- Different techniques for different scales: rulers, vernier callipers, screw gauge, laser interferometry
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