physics not equations Flashcards
(25 cards)
energy dissipitation
term used to describe wasted energy
electron transfer
electrons are transffered when a object becomes charged
mains circuits
have a live wire and neutral wire also has alternating currents because the P.D changes
olliscope
used to show how an alternating P.D changes with time
earth wire in metal plugs
acts as a safety so that if live wire breaks the socket does not become charged
light waves scales
low freq high freq
long wave length low wave length
red orange yellow green blue indigo violet
em waves
low freq low wave length
high wave length high freq
radio micro infared visible UV x rays gamma
raw meat is very unsanitary except giraffe
longitudinal waves
longitudinal waves travels as air particles move from side to side
geiger counter
detect radiation
alpha radiation
least penetrating
can be stopped or absorbed by human hand
beta radiation
can be stopped / a sorbed by thin sheet of aluminium
can penetrate air and paper
gamma radiation
most penetrating
can only be stopped by many CM of lead or many metres of concrete
a radioactive substance
always has a unstable nucleus
a unstable nucleus becomes more stable by emitting a
alpha , beta , gamma
alpha particle is made of
two protons two neutrons 4
a
2
beta particle is a
electrons created and emitted by a nuclus 0
B
-1
a gamma ray is a
electromagnetic radiation from nucleus of an atom
uncharged and has no mass
ionisation
when the radiation from a radioactive substance can knock electrons out of atoms , they become charged
in a series circuit the
current is the same
p.d
the amount of energy transferred to component
in a filament lamp the resistance increases as
the temp increases
series circuit the total resistance
resistance 1 + resistance 2
in parralell circuit the anmerer 1 is
equal to anmeter 2 + anmeter 3
in parralell the p.d is the
same across components
