Physics 1121 Quiz 1 (part 2) Flashcards
Quantum Mechanics
This type of mechanics describes the motion of extremely small atomic and sub-atomic particles that have extremely small mass
What are quantum mechanics and relativistic mechanics known as?
Modern Physics
Significant Figures
the number of digits deemed important for expressing a certain quantity. Count all non-zero digits and count all zero digits between the non-zero digits
- Addition & Subtraction – round to the same number of decimal places as the entry with the least number of decimal places.
-Multiplication & Division - round to the same number of digits as the entry with the least number of significant figures.
Exponent rules
Multiplication: add exponents
Division: Subtract exponents
Raising to a power: multiply exponents
Negative exponents: Make positive by flipping the problem (EX: 10^-2 = 1/10^2)
10^0 = 1
Line graph
shows how one value is affected by another value
Slope
Rise/run
Mathematical Relationships
describe how one variable is affecting the other variable.
4 types of mathematical relationships
Direct or Linear
Inverse
Exponential or Logarithmic
Inverse Square
Direct or Linear
as one value changes, the other changes in direct proportion.
EX: mAs and quantity of xrays
Inverse Relationship
as one value increases, the other value will decrease by the same amount.
Exponential or logarithmic relationship
one value will increase by linear numbers while the other value changes exponentially.
EX: kVp and quantity of xrays
Inverse Square
one value increases linearly while the other value decreases exponentially
EX: SID and quantity of xrays
Fundamental Units or Base Quantities
most basic units of measurement that do not depend on any other unit and upon which all others are derived.
There are 3 original fundamental units in the MKS and CGS system and 7 in the SI system.
Derived Units
all other units that are derived from the fundamental units.
