Modern Physics Flashcards
What is an ELECTRON?
An ELECTRON is a sub-atomic particle that orbits the nucleus. It has a mass of 9.1 x10¯³¹ kg and a charge of 1.6 x10¯¹⁹ C which is the fundamental frequency of charge
What is THERMIONIC EMISSION?
THERMIONIC EMISSION is the release of electrons from the surface of a hot metal
What are CATHODE RAYS?
CATHODE RAYS are streams of high-speed electrons moving from the cathode to the anode in an evacuated tube
What is the PHOTOELECTRIC EFFECT?
The PHOTOELECTRIC EFFECT is the release of electrons from the surface of a metal when UV light of a certain frequency is shone on it
What is the THRESHOLD FREQUENCY (f₀)?
The THRESHOLD FREQUENCY (f₀) for a given metal is the minimum frequency needed for photoemission to occur
What is the WORK FUNCTION (Φ)
The WORK FUNCTION (Φ) of a metal is the minimum amount of energy required by a photon to remove an electron from the surface of the metal
What are X-RAYS?
X-RAYS are high frequency electromagnetic radiation which are produced when high-speed electrons strike a metal target of high melting point
