Master fundamental definitions, SI base quantities, and scalar/vector distinctions for Cambridge International AS & A Level Physics (9702). Perfect for exam preparation and quick review.
20 cards
Front
What are the three components of a physical quantity?
Back
A physical quantity consists of: 1. **Numerical magnitude** (the size). 2. **Unit** (the standard of measurement, e.g., meters). 3. **Dimension** (the physical nature, e.g., length [L]).
Front
What is the SI base unit for Mass?
Back
The **kilogram (kg)**. It is defined by taking the fixed numerical value of the Planck constant *h* to be 6.626 x 10⁻³⁴ when expressed in the unit J s, which is equal to kg m² s⁻¹.
Front
What is the SI base unit for Time?
Back
The **second (s)**. It is defined by taking the fixed numerical value of the caesium frequency ΔνCs (the transition frequency of the caesium-133 atom) to be 9,192,631,770 when expressed in the unit Hz.
Front
What is the SI base unit for Length?
Back
The **meter (m)**. It is defined by taking the fixed numerical value of the speed of light in vacuum *c* to be 299,792,458 when expressed in the unit m s⁻¹.
Front
What is the SI base unit for Electric Current?
Back
The **ampere (A)**. It is defined by taking the fixed numerical value of the elementary charge *e* to be 1.602 x 10⁻¹⁹ when expressed in the unit C, which is equal to A s.
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