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.
