Study Guide 4: Sound, Light Flashcards
(27 cards)
How do we hear frequencies of sound?
As having different pitch
What types of wave is a sound wave?
Longitudinal (compression) wave
Mechanical wave
Increase of 20dB=
Pressure wave is ten times greater in amplitude
Loudness of sound affected by?
Frequency
Amplitude
What is the Doppler effect?
Shift in frequency when sound source is moving at speeds less than the speed of sound
Frequencies shift higher- objects moving towards
Frequencies shift lower- objects moving apart
Speed of sound in air
343 meters per second
Subsonic
Object moving slower than sound
Supersonic
Object moving faster than sound
Nodes
Points of minimum amplitude
Anitnodes
Points of maximum standing
How resonance is created
Spaces enclosed by boundaries with sound waves
When do beats occur
Two frequencies are close, not exactly the same
Intensity of light
Amount of energy per second falling on a surface
Intensity increases or decreases as it gets away from source?
Decreases
Speed of light
3.00 x 10(to the power of 8)
Light can come from two different processes
Emitted directly from object
We see the objects by reflected light
Additive primary colors
Red
Green
Blue
Subtractive primary colors
Cyan
Magenta
Yellow
Photons
Particle of light as tiny bundles of energy
Electromagnetic wave parts
Electric part
Magnetic part
Optics
Study of light behaves
Lens
Optical device used to bend light in a specific way (refraction)
Converging lens
Light comes together
Diverging lens
Light spreads
