Latent heat & fusion/fission Flashcards
The energy in an object’s potential store comes from…
the potential energy stored in the bonds between particles.
change in internal energy =mass×______________________×temperature change
specific heat capacity
E =
mcΔT
specific heat capacity=
change in internal energy/
mass (kg) x maximum temperature rise
thermal capacity=mass×______________________
specific heat capacity
What are the units of thermal capacity?
J/C
______________________= change in internal energy/
(mass×maximum temperature rise)
specific heat capacity
If you pour hot water into Leslie’s cube, _____________will emit more infra-red radiation than the other sides.
the matte (dull) black side
The infra-red radiation emitted is measured using a___________.
thermopile (a sensitive thermometer).
How can you detect latent heat?
use a joulemeter and measuring the energy supplied to change state
What is the energy that is transferred to a substance without the substance’s temperature changing called?
latent heat
_____ of the alpha particles passed straight through the foil
Most
When atoms emit electromagnetic radiation, …
electrons can drop to a lower energy level, closer to the nucleus.
When atoms absorb electromagnetic radiation, …
electrons move to a higher energy level further away from the nucleus.
Each electron shell has a
different energy level.
change in thermal energy=
temperature change x mass x specific heat capacity
Sources of background radiation
Foods, Radon gas, Rocks, The sun
More strongly ionising radiation is …
less able to penetrate materials
Describe the difference between atom and hydrogen bombs?
Hydrogen bombs use fusion
Atom bombs use fission
what does Contamination mean?
When radioactive substances are found on or inside an object.
what does Irradiation mean?
When something is exposed to radiation on its outside.
Which type of ionising radiation results in the emission of helium nuclei?
alpha radiation
