Topic Navigator

Noun Tree | Nouns Groups | Verb Groups | Search

Parent Categories

entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

physical entity go
an entity that has physical existence

process, physical process go
a sustained phenomenon or one marked by gradual changes through a series of states

phenomenon go
any state or process known through the senses rather than by intuition or reasoning

natural phenomenon go
all phenomena that are not artificial

physical phenomenon go
a natural phenomenon involving the physical properties of matter and energy

energy, free energy go
(physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work

radiation go
energy that is radiated or transmitted in the form of rays or waves or particles

electromagnetic radiation, electromagnetic wave, nonparticulate radiation go
radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge

radio wave, radio emission, radio radiation
an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m

noun.phenomenon

7 Subcategories

sky wave go
a radio wave that is reflected back to earth by the ionosphere or a communications satellite
ground wave go
a radio wave propagated on or near the earth's surface
radio signal go
a radio wave used to transmit and receive messages
carrier, carrier wave go
a radio wave that can be modulated in order to transmit a signal
short wave go
a radio wave with a wavelength less than 100 meters (a frequency greater than 3 megahertz)
medium wave go
a radio wave with a wavelength between 100 and 1000 meters (a frequency between 300 kilohertz and 3000 kilohertz)
long wave go
a radio wave with a wavelength longer than a kilometer (a frequency below 300 kilohertz)