what do most smoke alarms contain?

what do most smoke alarms contain?

the alpha particles cause..

this results in

when smoke enters the space between the two electrodes

A small amount of carbon in our atmosphere and in the bodies of animals and plants is radioactive ..

what do radioactive materials give out?

from..

because...

how is radiation measured?

does the radioactivity of a radioactive substance decrease or increase with time?

what happens during alpha emission

name 4 ways the nucleus of the new atom is different from the original atom

Alpha particles are..

REVISE CARBON DATING

what is ionisation?

what happens during beta emission?

the nucleus of the new atom is different from the original one because (4 reasons)

beta particles are

the nucleus of the new atom is different from the original one because (4 reasons)

what is a half life?

if the substance has a very long half life this means..

during alpha decay

during beta decay

what is a gamma ray?

what is background radiation?

where is it most released from?

how can the level of background radiation vary?

what else contributes to background radiation?

what other un natural way causes background radiation?

what are radioactive isotopes used for?

3 ways they are used in industry?

A gamma source is used in tracers because..

the progress of material is tracked by a detector above the ground so

what is ultrasound?

what type of wave does ultrasound travel in?

what is the amplitude?

what is the wavelength?

what is the frequency of a wave?

Name two things ultrasound can be used for

what is ultrasound imaging and body scans?

how is ultrasound used when breaking down kidney stones?

where are ultrasound waves partly reflected?

what are two main advantages ultrasound has over x-ray imaging?

what do all waves do?

what happens to the particles in longitudinal waves?

what happens to the particles in transverse waves?

what is a circuit?

electrons flow around the circuit from the...

what is resistance?

what is resistance measured in?

give three ways a current through a circuit can be controlled

for given resistor..

for fixed resistor...

THE LIVE WIRE IS

THE NEUTRAL WIRE

THE EARTH WIRE

whats the difference between a fuse and a circuit breaker? and what are they both?

what do they do?

4 steps to how a fuse works

but what needs to be in place for this safety feature to work?

all electrical appliances with outer metal cases must have an

this means...

how does this work?

all appliances with outer metal cases...

the appliances with insulated outer cases need..

why don't these appliances need to be earthed?

double insulated symbol

what is an insulating material?

how can a charge be built up between 2 objects?

what is this charge called?

why does the electricity stay on the material and not move?

what charge do electrons carry?

what charges are the materials left with after static electricity has taken place and the electrons have transferred?

give 4 examples of when static electricity can occur

how can you discharge an object?

what happens during this process?

if you become electrically charged earthing can result in you getting an....

give an example of when earthing occurs?

name some dangers that can occur with static electricity

and another one..

give two examples of when static electricity is a nuisance

two insulating materials with the same charge will

two insulating materials of the opposite charge will

the material that receives electrons becomes..

due to..

the material giving up electrons becomes..

the atoms that become charged are then called..

give 3 ways the chance of receiving an electric shock can be reduced..

lorries that contain flammable gasses, liquids, powders need to be earthed before unloading because..

connecting an aircraft to a fuel tanker...

name 3 things static electricity can be used for

how is a defibrillator used?

how are dust precipitators used when cleaning chimneys?

how is static electricity used in spray painting a car?

resulting in..