Astrophysics (Index)About

wavelength

(an alternative description of an electromagnetic wave's frequency or photon energy)

Wavelength is the length of a wave, the distance to the point where such a disturbance in a medium that constitutes a wave begins a repeat of itself. It has this relationship with wave speed and frequency:

wavelength × frequency = wave speed

A wave can be characterized by its wavelength or by its frequency, and in the case of electromagnetic waves, by or by its energy per photon (photon energy), which is directly related to frequency. Wavelength is typically used to describe this aspect of microwave, infrared, and visible light. Radio is more likely to be described by frequency and X-ray and gamma rays more likely to be described by photon energy.


(EMR,measure,waves)
Further reading:
http://en.wikipedia.org/wiki/Wavelength

Referenced by pages:
absorption
absorption line
Airy disk
Atacama Large Millimeter Array (ALMA)
angstrom (Å)
angular resolution
ARCADE
asteroseismology
astronomical quantities
Australia Telescope Compact Array (ATCA)
B
Balmer jump
Balmer series (H)
bandwidth
baseline
Balmer-break galaxy (BBG)
biofluorescence
black-body radiation
blind survey
bolometric luminosity (LBol)
Brackett series
Breakthrough Listen (BL)
brightness temperature (TB)
C-BASS
CCAT
Chandra Deep Field North (CDFN)
Chandra Deep Field South (CDFS)
Cherenkov radiation
chromatic aberration
ionized carbon fine structure line ([CII])
circumstellar disk
cosmic microwave background (CMB)
carbon monoxide (CO)
coherent light
cold gas
collimator
color index
Compton scattering
Compton wavelength
CONCERTO
confusion limit
continuous absorption
continuum
continuum emission
correlator
cosmic dust
cosmological time dilation
data cube
de Broglie wavelength
dispersion measure (DM)
Doppler shift
double-line spectroscopic binary (SB2)
extragalactic background light (EBL)
exoplanet eclipse light curve
eclipse mapping
effective temperature (Teff)
electromagnetic spectrum
emission
emission line
emissivity
electromagnetic radiation (EMR)
European Southern Observatory Very Large Telescope (ESO VLT)
etalon
Euclid
extreme ultraviolet (EUV)
electron volt (eV)
extinction
Faraday rotation
far infrared (FIR)
fiber positioner
filter
first galaxies
focal plane
foreground subtraction
Fabry-Pérot interferometer (FPI)
Fraunhofer lines
frequency
galactic electron density
gamma rays (GR)
Galactic All-sky Survey (GASS)
G band
Green Bank Telescope (GBT)
Giant Metrewave Radio Telescope (GMRT)
grating
gray atmosphere
gray body
gamma-ray burst (GRB)
greenhouse effect
grism
Gunn-Peterson trough
gravitational wave spectrum
H-alpha (Ha)
Hubble Deep Field (HDF)
high-energy astrophysics (HEA)
High Energy Transient Explorer (HETE)
imaging Fourier transform spectroscopy (IFTS)
imaging spectrometer
infrared (IR)
intensity
interferometer
interferometry
ionizing radiation
IRAS
irradiance
International Ultraviolet Explorer (IUE)
Keck Observatory
kilonova (KN)
Kirchhoff's law of thermal radiation
KMOS
Kramers opacity law
Lyman-break galaxy (LBG)
Lick indices
light curve
line blanketing
line broadening
line shape function
Large Millimeter Telescope (LMT)
LSPE-SWIPE
luminosity (L)
linearly variable filter (LVF)
Lyman alpha (Ly-α)
Lyman series (L)
magnitude
maser
mass spectrometer
microwave
mid infrared (MIR)
Mie scattering
millimeter astronomy
MITgcm
monochromatic luminosity
multichroic feedhorn array
multi-messenger astronomy
NANOGrav
near infrared (NIR)
New Worlds Mission
observable universe
1.3-mm observation
opacity (κ)
optical depth (τ)
Origins Space Telescope (OST)
panchromatic
Parkes Observatory
Paschen series
passband
phase curve
photoionization
photometric system
photon energy
photosphere
Planck function
planetary nebula (PN)
planetary nebula luminosity function (PNLF)
point source
plane of the sky (POS)
power law
protoplanetary disk (PPD)
pulsar timing array (PTA)
pulsar (PSR)
quantum efficiency (QE)
Radcliffe wave
radiance
radiant flux
radiative transfer (RT)
radio
radio astronomy
radiometer
Rayleigh-Jeans law
Rayleigh scattering
redshift (z)
rest wavelength
RMS astronomy
Rosseland mean opacity
equation of radiative transfer (RTE)
Schuster-Schwarzschild model
scintillator
SCUBA
secondary eclipse
spectral energy distribution (SED)
sensitivity function (S)
SIMSTACK
software telescope
source function (S)
spectral power distribution (SPD)
specific intensity
spectral band
spectral flux density (S)
spectral index (α)
spectral line
spectral line designation
spectral resolution
spectrometer
spectrometry
spectropolarimetry
spectroscope
spectroscopy
Spektr-R
SPHEREx
Spitzer Space Telescope (SST)
synchrotron self-Compton (SSC)
star formation (SF)
stellar structure
stellar temperature determination
Strömgren photometric system
submillimeter astronomy
Subaru XMM-Newton Deep Survey (SXDS)
synchrotron radiation
systematic error
temperature
Thomson scattering
Tomographic Ionized-carbon Mapping Experiment (TIME)
tired light
transiting planet
transit spectroscopy
TripleSpec (TSpec)
U
ultraviolet (UV)
ultraviolet astronomy
V
visible light
Very Large Array (VLA)
Very Long Baseline Array (VLBA)
vegetation red edge (VRE)
Very Small Array (VSA)
wavenumber (ν)
waveplate
wavefront error (WFE)
Wien approximation
Wien's displacement law
atmospheric window
Wide-field Infrared Survey Explorer (WISE)
XEUV
X-ray
Y-type star (Y)
young stellar object (YSO)
Zeeman-Doppler imaging (ZDI)

Index