Mattar And Antimatter Flashcards
What is an Alpha Particle?
A Particle made up of two protons and two neutrons.
What is the equation for beta minus decay?
A A. 0. _
X ——-> W + ß + ve
Z Z+1. -1
What is the equation for beta plus decay?
A A. 0.
X ——-> W + ß + ve
Z Z-1. +1
What are the seven regions of the electromagnetic spectrum in order of increasing frequency?
Radio waves, micro waves, inflated radiation, visible light, ultra violet,x-rays and gamma rays.
What is the speed of all types of electromagnetic radiation?
The speed of light which is 3.00*10^8
What name is given to the discrete packets of quanta that electromagnetic radiation is released in?
Photons
What is the equation that links photon energy and photon frequency?
E=hf
What is the value and unit of Planck’s constant?
6.63x10^-34 Js
What is the formula that links wavespeed, frequency and wavelength?
f=c/λ
What are the symbol and relative charge of an anti proton?
Symbol is _
p
Relative charge is -1
What are the symbol and relative charge of an antineutron?
Symbol: _
n
Relative charge of 0
What are the symbol and relative charge of a positron?
Symbol: e+
Charge of +1
What is meant by the rest mass of a particle?
The rest mass of a particle is the mass of the particle when stationary.
How do the rest masses of a particle and its antiparticle compare?
They are identical to each other
What is the law of conservation of energy?
Energy can not be created if destroyed it can only be converted into other forms.
Which (extremely famous) equation links energy and mass?
E=mc^2
What is meant by the rest energy of a particle?
The energy due to the particle’s rest mass.
What are the usual units of rest energy?
Megaelectronvolts (MeV)
What is pair production?
A process of converting energy to mass in which a gamma ray photon has enough energy to produce a particle-antiparticle pair.
A diagram to show pair production.
.
In pair production what must he minimum photon energy be?
The minimum photon energy must be at least equal to the minimum energy of the original particle.
What is the result when a particle meets its antiparticle?
They annihilate each other and their mass gets converted to energy in the form of a pair of gamma ray photons
How many photons are produced by annihilation?
A pair/ 2 photons are produced.
