Paper 1 Flashcards
What is the formula for specific charge?
(Charge x 1.60x10^-19) / (Mass x 1.67x10^-27)
Define Specific charge of an atom?
The specific charge is defined as its charge divided by its mass.
What is the ground state?
The ground state is the lowest energy level in the atom.
How do you convert eV to joules?
How do you convert joules to eV?
eV to joules
x1.60x10^-19
Joules to eV
How many types of mesons are there and what are they?
There are 7 types of meson, they are K^0 (dS), K^+ (uS)
Pie^- (dU) Pie^0 (uU, dD, sS) Pie^+ (uD)
K^- (sU) K^0 with a line on the top (sD)
What is a superconductor?
A wire or device made of a material that has zero resistivity at and below a critical temperature that depends on the material.
Where are superconductors used?
They are used to make high-power electromagnets that generate very strong magnetic fields in devices such as MRI scanners and particle accelerators.
What are the formulas for working out the distance in projectiles?
For the x direction: Distance = Ut
For the y direction: Distance = 1/2gt^2
Define emf?
The electromotive force of a source is the loss of potential difference per unit current in the source when current passes through the source.
What is annihilation?
Annihilation occurs when a particle and a corresponding antiparticle meet and their mass is converted into radiation energy. Two photons are produced in the process (this ensure a total momentum of zero after the collision, one can’t do this)
What is a lepton and baryon number?
A baryon number is a number of baryons in an in a system of subatomic particles minus the number of antibaryons.
A lepton number is assigned to everyone lepton (+1) and antilepton (-1), on the basis that the total lepton number for each branch of the lepton family is always conserved.
Describe the photoelectric effect
The photoeletric effect, was the emission of electrons from a metal surface when light is directed at the surface.
What is the equation for beta plus and beta minus decay?
For beta plus:
- The atom decays through the W^+ Boson into a B^+ and a neutrino
For beta minus:
- The atom decays through the W^- Boson into a B^- and an antineutrino
Describe the photoelectric effect
The photoeletric effect, was the emission of electrons from a metal surface when alight is directed at the surface and the light has a frequency greater than the minimum value (threshold frequency)
What is Ohm’s law?
Ohm’s law states that the PD across a metallic conductor is proportional to the current through it, provided the physical conditions do not change.
