CH7

Question 1

Definition of black body

Answer 1

Idealised body that is able to absorb electromagnetic radiation that falls on it and emits thermal radiation depending on its temperature

Question 2

Characteristic of quantum of energy

Answer 2

Discrete energy packet and not continuous

Question 3

Definition of photons

Answer 3

Light energy transferred in quantum of energy

Question 4

Definition of photoelectric effect

Answer 4

Emission of electrons from a metal surface illuminated by beam of light at certain frequency

Question 5

Definition of threshold frequency

Answer 5

Minimum frequency required to produced photoelectric effect on a metal

Question 6

3 Characteristics of photoelectric effect

Answer 6

Kinetic energy is directly proportional to frequency of photon
Kinetic energy is not influenced by intensity of light
Photoelectrons are emitted instantaneously when metal surface is illuminated

Question 7

Definition of work function

Answer 7

Minimum energy required for a photoelectron to be emitted from a metal surface