Definitions

Question 1

Absolute zero

Answer 1

-273 degrees

0K

Question 2

Nuclear Activity

Answer 2

The number of unstable nuclei in a radioactive sample that decay each second

Question 3

Binding energy

Answer 3

The energy released when a nucleus forms

Or

The energy required to separate all nucleons in that nucleus.

Or

Equivilant to mass defect

Question 4

Boyles law

Answer 4

At constant temperature, pressure and volume are inversely proportional

Question 5

Charles law

Answer 5

At a constant pressure, temperature and volume are directly proportional

Question 6

Decay constant

Answer 6

The probability of an unstable nuclei decaying in a unit of time.
Measure of how quickly an isotope will decay

Question 7

Eddy current

Answer 7

A looping current induced by the changing magnetic flux in the core of a transformer

Question 8

Electric field strength

Answer 8

The force per unit positive charge experienced by a body in an electric field

Question 9

Electric potential

Answer 9

The electrical potential energy a positive charge (+1C)would have at a specific point

Question 10

Electromagnetic induction

Answer 10

Inducing an emf by cutting field lines

Question 11

Faraday’s law

Answer 11

The induced emf is directly proportional to the rate of change of flux linkage

Question 12

Geostationary satillite

Answer 12

An earth satellite that orbits directly over the equator and is always above the same point because it moves at the same angular velocity. Has a period of 24 hours

Question 13

Gravitational field strength

Answer 13

The amount of force per unit of mass experienced by a body in a gravitational field.

Question 14

Gravitational potential

Answer 14

The gravitational energy a unit of mass would have at a specific point

Question 15

Gravitational potential energy

Answer 15

The energy stored by an object due to its position in a gravitational field it equals the work done moving an object from infinity to that point

Question 16

Lenz’s law

Answer 16

The induced emf is always in such a direction as to oppose the change that caused it

Question 17

Low orbiting satellite

Answer 17

2000km

Higher angular speed than the earth’s, used for spying, mapping etc

Question 18

Magnetic field

Answer 18

A region in which a force acts on magnetic materials or magnetically susceptible materials

Question 19

Magnetic flux density/magnetic field strength

Answer 19

The force on 1m of wire carrying 1A at right angles to magnetic field

Question 20

Pressure law

Answer 20

Constant volume, pressure and temperature are directly proportional

Question 21

Specific heat capacity

Answer 21

The amount of energy required to raise the temperature by 1°C for 1kg of mass

Question 22

Specific latent heat

Answer 22

Quantity of thermal energy required to change the state of 1kg of a substance, melting or vaporising without temperature change

Question 23

Time constant

Answer 23

Time taken for the charge, pd or current in a capacitor to drop by 37% 0.37 of initial value

Question 24

Equation for escape velocity

Answer 24

V^2=2Gm/r

Question 25

Gravitational potential energy, but gravitational fields

Answer 25

GMm/r

Question 26

Magnetic flux

Answer 26

Magnetic flux density times by the area. Number of magnetic field lines passing through the area