Physical science ch 7, 8, and 9
Coulomb
unit of electric charge
Electrical forces
Holds atoms and molecules together
ray diagram
How you solve images formed by spherical mirrors graphically
real image
Images that can be formed on a screen
Virtual image
Images that cannot be formed on a screen
Refraction
The bending of a wave accompanied by speed change and a wave length
Diffraction
The bending of a wave around obstacles and openings
Direct Current (DC)
The electron flows in on direction from negative to positive
Photo electric effect
The emission of electrons from a metal when light shines on the metal
Electromagnetism
The interaction between electricity and magnetism
Convex (diverging)
The outside if a spherical section. Thicker at sides
Voltage
The potential difference measured in volts. The amount of work to be done to move a charge from one point to another along an electric circuit.
Polarization
The preferential orientation of the field vectors
Destructive
Wave pulses cancel out each other
Law of Charges
like charges repel, unlike charges attract
Irregular reflection
the bouncing of light in many directions from an uneven surface
Quantum energy
the minimum quantity of energy that can be lost or gained by an atom
near point
the shortest distance at which an object is in sharp focus
Alternation Current (AC)
Constantly changing the voltage from positive to negative and back
closed switch
A complete circuit
Electric charge
A fundamental quantity
Beam
A group of parallel rays
Generator
A machine that converts mechanical energy into electrical energy
magnetic field
A set of imaginary lines that indicates the direction in which a small compass need would point
Ray
A straight line representing the path of light
Spectrometer
An instrument that separates light into a spectrum.
quantum
An oscillating electron can only have specific amounts of energy
classical wave theory
Light is both a wave and a particle
lens
Materials that refract light waves
line-emission spectrum
Narrow beam of the emitted light was shined through a prism, it was separated into four specific colors of the visible spectrum.
Open switch
Not a complete circuit
semiconductor
Not good as a conductor or insulator
Dalton model of the atom
Proposed that an element is composed of tiny, indivisible, indestructible particles.
electric motor
a device that converts electrical energy into mechanical energy
electrical conductor
a material in which charges can move freely
electrical insulator
a material in which charges cannot move freely
concave (converging)
a mirror with a surface that curves inward. Thicker at the center
Line absorption spectrum
dark vertical lines against a continuous range of colours, each line corresponding to a certain wavelength
Ernest Rutherford
discovered the atomic nucleus and proposed a nuclear model of the atom .
Thomas Plum Pudding Model
he thought electrons were randomly distributed within a positively charged cloud
Regular reflection
occurs when parallel rays of light hit a smooth surface
