Key Terms - Column 1 Done

Question 1

Acceleration

Answer 1

Change of velocity per second (in mergers per second squared m^2)

Question 2

Activity

Answer 2

The number of unstable atoms that decay per second in a radioactive source

Question 3

Alpha Radiation

Answer 3

Alpha particles, each composed of two protons and two neutrons, emitted by unstable nuclei - this is also a hydrogen nucleus

Question 4

Alternating Current

Answer 4

Electric current in a circuit that repeatedly reverses its direction

Question 5

Alternator

Answer 5

An alternating current generator

Question 6

Amplitude

Answer 6

The height of a wave crest or through of a transverse wave from the rest position. For the oscillating motion, the amplitude is the maximum distance moved by an oscillating object from its equilibrium position

Question 7

Angle of Incidence

Answer 7

Angle between the incident ray and the normal

Question 8

Angle of Reflection

Answer 8

Angle between the reflected ray and the normal

Question 9

Atomic number

Answer 9

The number of protons (which is equal tot he number of electrons) in an atom, it is sometimes called the proton number

Question 10

Beta radiation

Answer 10

Beta particles are high-energy electrons created in, and emitted from, unstable nuclei

Question 11

Big Bang Theory

Answer 11

The theory that the universe was created in a massive explosion (the Big Bang), and that the universe has been expanding ever since

Question 12

Biofuel

Answer 12

Any fuel taken from living or recently living materials, such as animal waste

Question 13

Black Body Radiation

Answer 13

The radiation emitted by a black body (a body that absorbs all the radiation that hits it)

Question 14

Black Dwarf

Answer 14

A star that has faded out and gone cold

Question 15

Black Hole

Answer 15

An object in space that has so much mass that nothing, not even light, can escape from its gravitational field

Question 16

Boiling Point

Answer 16

Temperature at which a pure substance boils or condenses

Question 17

Boyle’s Law

Answer 17

For a fixed mass of gas at room temperature, its pressure multiplied by its volume is constant

Question 18

Braking Distance

Answer 18

The distance travelled by a vehicle during the time it takes for its brakes to act

Question 19

Carbon Neutral

Answer 19

A biofuel from a living organism that takes in as much carbon dioxide from the atmosphere as is released when the fuel is burned