10.5

Question 1

luminous

Answer 1

releasing its own light

Question 2

incandescent

Answer 2

describes objects that emit light when they are hot

Question 3

bioluminescent

Answer 3

describes living things that release light energy

Question 4

non-luminous

Answer 4

describes objects that do not emit their own light, but can be seen by reflected light

Question 5

scattered

Answer 5

describes light sent in many directions by small particles within a substance

Question 6

visible spectrum

Answer 6

different colours that combine to make up white light; they are separated in rainbows

Question 7

dispersion

Answer 7

separation of the colours that make up white light. Each colour is bent differently when it enters or leaves a glass prism.

Question 8

electromagnetic radiation

Answer 8

the radiant energy such as radio waves, infra-red, visible light, X-rays and gamma rays released by magnetic or electric fields

Question 9

electromagnetic spectrum

Answer 9

complete range of wavelengths of energy radiated as electric and magnetic fields

Question 10

Radio waves

Answer 10

low energy electromagnetic waves with a much lower frequency and longer wavelength than visible light

Question 11

Infra-red radiation

Answer 11

invisible radiation emitted by all warm objects. You feel infra-red radiation as heat.

Question 12

ultraviolet radiation

Answer 12

invisible radiation similar to light but with a slightly higher frequency and more energy

Question 13

X-rays

Answer 13

high energy electromagnetic waves that can be transmitted through solids and provide information about their structure

Question 14

Gamma rays

Answer 14

high energy electromagnetic radiation produced during nuclear reactions