Keywords

Question 1

Acceleration

Answer 1

Change of velocity per second (in metres per second per second, m/s^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 2 protons and 2 neutrons, emitted by unstable nuclei

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 trough of a transverse wave from the rest position. For 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

Atomic number

Answer 8

the number of protons (which equals the number of electrons) in an atom. It is sometimes called the proton number

Question 9

Angle of reflection

Answer 9

Angle between the reflected ray and the normal

Question 10

Beta radiation

Answer 10

Beta particles that 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