# G485keywords

electric field strength
force per unit positive charge
1 of 24
magnetic flux density
flux density perpendicular to a wire = magnetic force on a wire/(length of wire × current flowing through wire)
2 of 24
tesla
1 tesla = the flux density that causes a force of one newton on a wire of length one meter carrying a current of one amp
3 of 24
magnetic flux
magnetic flux = magnetic flux density × cross sectional area perpendicular to magnetic field
4 of 24
weber
1 weber = the flux due to a flux density of one tesla passing through an area of one m^2
5 of 24
flux linkage to a coil = flux passing through one turn × number of turns
6 of 24
induced E.M.F. is proportional to the rate of change of magnetic flux
7 of 24
capacitance
charge per unit potential difference
8 of 24
coulomb per volt
9 of 24
time constant
time for the charge to fall by a factor of e
10 of 24
proton number
number of protons in a nucleus
11 of 24
isotopes
nuclei with the same proton number but different nucleon numbers
12 of 24
activity
number of decays per unit time
13 of 24
decay constant
the probability of decay of a nucleus per unit time
14 of 24
half life
the time for the activity of a sample to half
15 of 24
binding energy
minimum energy to separate all nucleons of a nucleus
16 of 24
binding energy per nucleon
minimum energy to separate all nucleons of a nucleus divided by the number of nucleons in the nucleus
17 of 24
Hubble's law
the speed of recession of a galaxy is proportional to its distance from the observer
18 of 24
the cosmological principle
on a large scale the universe is uniform (isotropic and homogeneous)
19 of 24
critical density
the density for which the rate of expansion of the universe tends to zero
20 of 24
AU
mean distance between the earth and sun
21 of 24
parsec
distance from a base length of AU that subtends an angle of 1 arcsecond
22 of 24
light-year
the distance traveled at the speed of light in one year
23 of 24
intensity
power per unit cross-sectional area
24 of 24

## Other cards in this set

### Card 2

#### Front

flux density perpendicular to a wire = magnetic force on a wire/(length of wire × current flowing through wire)

#### Back

magnetic flux density

### Card 3

#### Front

1 tesla = the flux density that causes a force of one newton on a wire of length one meter carrying a current of one amp

### Card 4

#### Front

magnetic flux = magnetic flux density × cross sectional area perpendicular to magnetic field

### Card 5

#### Front

1 weber = the flux due to a flux density of one tesla passing through an area of one m^2