extras Flashcards
describe power
the rate of energy transfer
how to convert from Celsius to kelvin
-273
the kelvin temperature of gas is proportional to what
the average kinetic energy of its molecules
what do alpha beta and gamma all have in common
they are ionising radiations emitted from unstable nuclei in a random process
what is a Bequerel
the activity of a radioactive siurce
why do some atoms emit radiation
to become more stable because they have too many of too few neutrons
discuss potential safety advantages of using a fusion reactor compared with a fission reactor
fusion:
- reactants not as hazardous
- so no damage to cells/mutations
- products are not radioactive
- so no storage problems
- lower risk of meltdown
- no runaway chain reactions
describe the difference between nuclear fission vs nuclear fusion
fission - splitting of a nucleus
fusion - joining of two nuclei
what is the easiest way to stop alpha particles
can’t penetrate 10cm air
what energy store is increased when the paper stops the alpha particle
thermal
explain how the Doppler effect causes the observed frequency if sound to change for people on the ground when a rocket takes off
speed of waves constant
- and wavefronts behind spread out
- causing an increased wavelength
- so observed frequency decreases
- because freq = speed/wvlngth
explain why the compass needles turn when the current switches on
- because a magnetic field is created
- so the magnets will feel a force and line up along the field line
what do the fingers represent on flemings left hand grip rule
force = thumb
field = pointy finger
current = middle
explain what direction the wire is moved in the magnetic field to produce a current
cutting across the field lines
explain why a current is produced when a wire is moved through a magnetic field
- cutting across field lines induces a voltage across the wire
- and it is a complete circuit so voltage give a current
