F = BIL sin(theta) where F is the force on a wire of length L carrying a current I at an angle theta to the field

3 of 27

Define Tesla

1T is the magnetic flux density when a wire of length 1m, carrying a current 1A at a right angle to the field experiences a force of 1N

4 of 27

Define the unified atomic mass unit u

1/12 of the mass of a carbon 12 nuclide

5 of 27

Define Weber

The magnetic flux when a magnetic field of flux density one Tesla passes at right angles through an area of one square metre

6 of 27

Define Magnetic Flux Linkage

Flux through one coil x number of coils

7 of 27

State Faraday's Law of Induction

The magnitude of induced EMF is equal to the rate at which the magnetic flux is cut

8 of 27

State Lenz's Law

The direction of any induced current is in a direction that opposes the flux change that caused it

9 of 27

Define Capacitance

The charged stored per unit potential difference

10 of 27

Define Farad

One Coulomb per Volt

11 of 27

State the sum rule for capacitors in parallel

C = C1 + C2 + C3 + ...

12 of 27

State the sum rule for capacitors in series

1/C = 1/(C1) + 1/(C2) + 1/(C3) + ...

13 of 27

Define Time constant of a circuit

Time for the charge to have decreased to 1/e of its original charge, given by CR

14 of 27

Define what is meant by an isotope of an element

Same number of protons, different number of neutrons

15 of 27

Define Activity

The rate at which a source emits radioactive particles

16 of 27

Define Becquerel

An activity of one particle per second

17 of 27

Define Decay Constant

The probability of decay of a nucleus per unit time

18 of 27

Define Half Life

The time taken for the activity of the source to decrease by one half. It is also the time taken for the number of radioactive nuclei to decrease by one half

19 of 27

Define the binding energy of a nucleus

The energy required to separate all the nucleons of a nucleus to infinity

20 of 27

Define Intensity

Power per cross sectional Area

21 of 27

State Hubble's Law

The recession speed of a galaxy is directly proportional to its distance from Earth

22 of 27

State the Cosmological Principle

On large scales, the Universe is: 1) Isotropic (The same in all directions) and 2) Homogeneous (has the same density)

23 of 27

Define the Astronomical Unit

The average distance from the centre of the sun to the earth

24 of 27

Define Parsec

Distance from a base length of 1AU that subtends an angle of 1 arc second

25 of 27

Define light year

The distance travelled by an electromagnetic wave in one year

26 of 27

Define Critical Density

The density required for the universe to have a flat geometery

27 of 27

Other cards in this set

Card 2

Front

Electric field strength, V/d

Back

Define Potential Gradient

Card 3

Front

F = BIL sin(theta) where F is the force on a wire of length L carrying a current I at an angle theta to the field

Back

Card 4

Front

1T is the magnetic flux density when a wire of length 1m, carrying a current 1A at a right angle to the field experiences a force of 1N

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