Electromagnetic radiation and atomic spectra Flashcards
electromagnetic radiation can be described in terms of….
waves and characterised in terms of wavelength and frequency
the relationship between wavelength and frequency is…
c=f lamda
the different types of radiation arranged in order of wavelength are known as the…
electromagnetic spectrum.
electromagnetic radiation can be described as a…
wave and a particle, and is said to have a dual nature
when electromagnetic radiation is absorbed or emitted by matter is behaves like a stream of particles… these particles are known as…
photons
A photon carries…
quantities energy proportional to the frequency of radiation
when a photon is absorbed or emitted…
energy is gained or lost by electrons within the substance
the photons in high-frequency radiation can…
transfer greater amounts of energy than photons in
low-frequency radiation
the energy associated with a single photon is…
E=HF E=hc/lamda
the energy of one mole of photons is given by…
E=lhf E=Lch/lamda
Energy is often in units of…
Kjmol-1
when energy is transferred to atoms…
electrons within the atoms may be promoted to higher energy levels.
an atom emits a photon of light energy when…
an excited electron moves from a higher energy level to a lower energy level
the light energy emitted by an atom produces a ….
the spectrum that is made up of a series of lines at discrete energy levels. this provides direct evidence for the existence of these energy levels
in absorption spectroscopy…
electromagnetic radiation is directed at an atomised sample.
as electrons are promoted to higher energy levels…
radiation is absorbed
