Quiz Flashcards
light is a form of _____
electromagnetic radiation
light is composed of perpendicular oscillating waves, one for the ___ field and one for the ____ field
electric; magnetic
a(n) ___ field is a region where electrically charged particle experiences a force
electric
a(n)___ field is a region where magnetized particle experiences a force
magnetic
speed of light
3.0 x 10^8 m/s
the ____ is the height of the wave
amplitude
the amplitude is the distance from ___ to ___
node to crest or node to trough
the ___ is a measure of light intensity - the larger the amplitude the brighter the light
amplitude
the ___ is a measure of the distance covered by the wave
wavelength
the distance from one crest to the next (or one trough to the next) or the distance between alternate nodes is ___
wavelength
the ___ is the number of waves that pass a given point in a given period of time
frequency
the number of waves = the number of ___
cycles
units for frequency
hertz or cycles/s = s^-1
the total energy is ____ to the amplitude of the waves and the frequency
proportional
the larger the amplitude, the more ___ it has
force
the more frequently the waves strike, the ___ total force there is
more
for waves traveling at the same speed, the shorter the wavelength, the ___frequently they pass
more
the wavelength and frequency of electromagnetic waves are ___ proportional
inversely
frequency equation
v = c/wavelength
the color of light is determined by its ___ or ___
wavelength or frequency
____ light is a mixture of all the colors of visible light
white
The observed color is predominantly the colors ___
reflected
electromagnetic spectrum (lowest to highest)
radio microwave infrared visible ultraviolet xray gamma
1nm = ____ m
10^-9
10^9 nm = ____ m
1
the interaction between waves is called ___
interference
_________ : when waves interact so that they add to make a larger wave (_ phase)
construction interference - in phase (crest w/crest, trough w/trough)
______: when waves interact so they cancel each other it is called ___________
destructive interference; out of phase
it was observed that many metals emit electrons when a light shines on their surface - this is called the ____ effect
photoelectric (shiny metal)
if the wavelength of light is made shorter, or the light wave’s intensity made brighter, ___ electrons should be ejected
more
the energy of a wave is ___ proportional to its amplitude and frequency
directly
einstein proposed that the light energy was delivered to the atoms in packets called ___ or ___
quanta; photons
the energy of a photon of light is ___ proportional to its frequency and ____ proportional to its wavelength
directly; inversely
the proportionality constant is called ____ constant and has value of ____
Planck’s; 6.626x10^-34
energy =
planck’s constant times frequency or planck’s constant times speed of light divided by wavelength
kinetic energy =
energy of photon - binding energy
