Chapter 7.3 - 'Electromagnetic Waves And Synchrotron Radiation' Flashcards
State how electromagnetic waves are created.
Created by accelerating charges.
State the result when two charges are accelerated.
Two rapidly changing fields are emitted from the source at the speed of light, a magnetic and electric field.
State the frequency human’s eyes are adjusted to.
State what this frequency represents.
400THz - 800THz Visible light (400nm-800nm)
State how visible light is produced.
Through the rearrangement of electrons in atoms and molecules.
List the forms of EMR from smallest to largest.
State how these are produced.
Radio waves. - charges accelerated through wires.
Microwaves. - accelerating charges along metal antennae.
Infrared. - any object with thermal energy as the molecules vibrate.
Visible light. - rearrangement of electrons in atoms.
Ultraviolet. - movement of charged particles.
X-rays. - fast moving electrons fired into metal target, decelerating.
Gamma rays. - released from nucleus of radioactive atoms.
State what a synchrotron is.
A large machine producing and accelerating electrons close to the speed of light.
State what synchrotron light is.
EMR emitted when charged particles e.g electrons are accelerated in curved paths in a synchrotron path.
State the advantages of synchrotron light.
It has:
A broad spectral range, from microwaves to X Ray’s.
High intensity or brightness.
Well defined, coherent beam.
Potential to be tuned to required frequencies.
State what EMR stands for.
Electromagnetic radiation.
