Physics unit 7
Terms in this set (33)
A rhythmic disturbance that carries energy.
Wavelength ( λ )
The distance between identical points on two waves
How much energy a wave carries
Frequency ( f )
The number of waves that pass a point in a given time.
(usually measured in hertz hz waves/second)
V = ( λ) f
Waves that need a medium to pass through. Water sound rope
Waves composed of alternating electric and
magnetic currents. Light Electric IR
causes particles of a medium to vibrate
perpendicular to the direction of the wave. Water waves
causes the particles of the medium
to vibrate in a parallel direction to the wave motion. Springs & sound waves
is a single disturbance traveling through a medium
PERIOD OF A WAVE
The time required for one pulse to pass a given point.
WAVE SPEED IN A MEDIUM
For mechanical waves: the denser the medium the faster the wave moves
EM the slower (light)
Waves goes to a more rigid medium it is reflected
inverted or out of phase
less rigid medium it is reflected erect or
Occurs when two pulses combine to produce a
pulse of greater amplitude.
When two pulses out of phase w/ one another
decrease eachothers amplitude as they pass. Once again the
waves are unchanged after passing one another.
A point in a medium that never undergoes displacement as
two equal but opposite waves interfere.
Caused by two series of waves interfering w/ eachother
constructively and destructively
The Law of Reflection
States that the angle of incidence is always equal to the
angle of reflection.
approaches a boundary to
another medium at an angle , the wave fronts
direction is changed
The index of refraction of a medium is equal
to the ratio of the angle of incidence and the angle of
The bending of a wave around an obstacle in their path
electromagnetic waves that are able to stimulate
the human eye
The rate at which light energy falls on a unit area some
distance from the light source.
Equation for illuminance
E = I/d²
I= intensity in candelas
Polarization of light
vertical diffraction grating it only allows rays
oriented in the perpendicular plane through eliminating the
Supports Wave theory
NEWTON'S PARTICLE THEORY OF LIGHT
Light is made of particles
Obey laws of physics
particles of two intersecting beams do not scatter
Supports Particle theory
Law of reflection
Quantum theory 1905