2Q: electromagnetic waves Flashcards
is believed to have a dual nature.
light
the dual natures.
particle and wave
as a _____, light carries it bundles of energy called photons
particle
bundles of energy
photons
_________ is produced when photons travel and interact with electric fields.
electromagnetic radiation
properties shiz:
reflection, refraction, interference, diffraction, polarization
key word: bounces
reflection
key word: bends
refraction
keyword: separation
diffraction
keyword: thin
polarizataion
are transverse oscillating waves composed of electric and magnetic waves.
electromagnetic waves
speed of em waves when they travel in a vacuum
3.0 x 10 8 m/s
shows the different types of em waves
em spectrum
order of em spectrum
radio, microwaves, infrared, visible, ultraviolet, x-ray, gamma rays
have the longest wavelength and the lowest frequencies
radio waves
have a frequency higher than those of radio waves.
examples include wifi and bluetooth
microwaves
frequency range of microwaves
300MHz to 300 GHz
sub bands of microwaves
L, S, C, X, and K
types of microwaves that are used for GPS
L
RADAR meaning
radio detection and ranging
-are found between microwaves and visible light.
-invisible to the naked eye but can be detected in the form of heat.
infrared
in this year, who first recorded the thermal measurement at the far end of the red spectrum, hence the name infrared.
1800, William Herschel
infrared came from the prefix infra meaning ____
below
it is the only part of the em spectrum that can be seen by the unaided eye.
visible light
colors of the frickin’ rainbow XDDDDD
red, orange, yellow, green, blue, indigo, violet
it is when visible light is emitted, certain patterns of dark lines and colors appear; which help in identifying the structure and composition of substances etc etc katamad magtype
spectral signatures
in ____, this scientist successfully proved the existence of energy beyond the violet spectra of the visibe light, naming it uv
1801, John River
extends from the violet spectra of the visible light through x-rays
ultraviolet
uv wavelength
10-400nm
least harmful uv
uva
uv that causes sunburn because of the chemical reaction to the skin
uvb
most harmful but absorbed by the ozone layer
uvc
xrays were first observed and documented by ______ in ____
Wilhelm Conrad Roentgen, 1895
their wavelengths are small which are why the energies carried in this and gamma rays are described in ____
x-ray, electron volts
xrays carry _______
100eV to 200keV
xrays are classified to
soft x-rays and hard x-rays
____ carry smaller amounts of energy (x-rays) this energy allows them to penetrate through matter
soft x-rays
are found in the end of the spectrum, meaning they contain the highest energy of all
gamma ray
range of gamma rays
200 keV to 200 meV
natural causes of gamma rays
pulsars, supernova explosions, neutrons stars, and decay of radioactive elements
what are the uses of gamma rays
treating cancer cells
