dk paper 1 Flashcards
(24 cards)
bigest prefix
peta (P) *10^15
mass
measure of resistance to acceleration
couple
a pair of parallel = and opposite forces acting on a body but not in a straight line
torque
product of the force of a couple (one of them) and the perpendicular distance between them
graph with speed distribution and temp
maxwell boltzmann distribution
low temp - more particles at rms (less spread) but lower rms speed
damping
light
heavy
critical
g against r
starts stright line down then curve back up
straigh line until rE
NEG QUADRANT
black hole vs neutron star
black hole > 3M
2-3 neutron star
parsec
distance at which a radius of 1AU subtends an arc of 1 arc second
emission spectra
cool gas heated
continuous spectra
black body radiator eg heated metal, star
absorption spectra
continuous passed through a cool gas
eg light from stars through their atmosphere
black body
absorbs all radiation incident on it
emits a characteristic distribution of wavelengths at a specific temp
boyles law
P prop 1/V
parallax angle
the apparent shift in position of a close star vs much more distant stars as the Earth make a quater of an orbit round the sun
stefans law
luminosity = T^4 r^2
wire graph
straigh line up then curves off
straight line down - not to origin
weins law
lamda max prop to 1/T
rubber band graph
hysterisys loop
s curev for unloading and loading - goes back to origin
ductile graph
eg polytheme
curve up then straigh line back down - far from origin
time after big bang
0s - time and space created - singularity
10^-35 - inflation - no matter
10^-6 - fundamental particles - quarks, leptons
10^-3 - hardons form
1 - creation of matter stops
100 - nuclei made - H and He
why hydrogren
high intensity
abundant
red shift from further away galaxy orbiting centre of mass
less intense
more red shift
periodic shift in wavelength
adding / subtracting ABSOLUTE uncertaincy
add the uncertaincy
(add % u if timesing only)
