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level: Notes

Questions and Answers List

level questions: Notes

QuestionAnswer
A mediumA substance through which a wave can travel
Wavelength (ℷ)The distance between each crest or trough
Amplitude (A)The height of the wave
Frequency (f)The amount of waves passing a point each second
When wavelength is large, frequency is...When wavelength is large, frequency is small
PropagationThe direction of the wave's travel
When wavelength is small, frequency is...When wavelength is small, frequency is large
OscillationThe way that the wave's medium moves
CompressionsCrests of longitudinal waves
rarefactionstroughs of longitudinal waves
wavelength (ℷ)The distance between crests and troughs
Sound is a...waveSound is a longitudinal wave.
Pitch is determined by...frequency
When wavelength is small, pitch is...When wavelength is small, pitch is high
Sound is a...wave.Sound is a longitudinal wave
Pitch is determined by...Pitch is determined by frequency
The primary factor that determines the pitch of soundThe frequency
The factor which determines the volumeThe amplitude
Relationship between pitch and speedWhen pitch is high, speed is also high
Relationship of air temperature, and the speed of soundWhen air temperature is high, the speed of sound is also high
Sonic wavesf = 20Hz - 20,000Hz
Ultrasonic wavesf > 20,000Hz; are not audible to human ear
Infrasonic wavesf < 20Hz; are not audible to human ear
The speed of light in air (c) (to two significant digits)3.0x10^8 m/sec
The medium of a light waveDetermines the speed of the wave: the denser the medium, the slower the speed of the light wave.
Wave interferenceoccurs when the crest from one wave overlaps with a trough from another wave
Constructive interferenceoccurs when the crests from one wave add to the crests from another wave; this also applies to the troughs
Destructive interferenceoccurs when two waves overlap, and cancel each other out
Maxwells Equations and lightMaxwells equations tell us that light is an electromagnetic wave.
How light waves travelLight waves travel by oscillating electric and magnetic fields.
Photoelectric effectWhen light is shone on a metal surface, electrons fly off the metal. These electrons are called photoelectrons.
Work functionThe energy with which a metal holds on to its electrons. A wave can give enough energy to electrons so that they have more energy than the work function of the metal, allowing them to break free of the metal.