Doppler Effect

Doppler Effect

change in frequency caused by the motion of a sound source, receiver, or reflector

When does the doppler effect occur?

when the source or receiver or both are moving relative to each other.

As the frequency comes toward you it has a

higher pitch

As frequency goes away from us, it has a

lower pitch

The higher the frequency the _____ the wavelength

closer the waves

What is faster, light or sound

light

Supersonic

faster than the speed of sound

red shift and blue shift

red shift: when wavelengths separate, blue shift: when wavelengths shorten

Frequency

The number of complete waves that pass a given point in a certain amount of time

Pitch

a tone's experienced highness or lowness; depends on frequency

loudness

A sensory characteristic of sound produced by the amplitude (intensity) of the sound wave

decibel

a unit that compares the intensities of different sounds

mechanical wave

A wave that requires a medium through which to travel

electromagnetic waves

A form of energy that can move through the vacuum of space.

Hertz

Unit of frequency

crest

Highest point of a wave

Trough

Lowest point of a wave

Wavelength

The distance between two corresponding parts of a wave

speed of sound

340 m/s

longitudinal wave

A wave in which the vibration of the medium is parallel to the direction the wave travels

Compression

The part of a longitudinal wave where the particles of the medium are close together.

rarefaction

a part in a longitudinal wave where the particles are spread apart

Reflection

The bouncing back of a wave when it hits a surface through which it cannot pass.

Absorption

to take in or transfer energy to a medium

Transmission

the passage of light through an object

low frequency

long wavelength, low energy

objects that refract

water, lenses, prisms, microscope, telescope, magnifying glass, hand lens

Direct Relationship

a relationship in which one variable increases with an increase in another variable

Indirect Relationship

a relationship when one variable increases while the other variable decreases

high frequency

short wavelength, high energy