Light

Light travels in​ (a)   lines.

• straight
• circular
• curved

Light can only travel through ​ (a)   materials.

• transparent
• opaque
• thick

Comparing Light and Sound

a

b

c

d

Longitudinal wave.

Faster in LESS dense materials

Faster in MORE dense material

Can travel through a vacuum

Sort these pictures into luminous and non-luminous:

a

b

c

d

sun

paper

mirror

traffic light

A non-luminous object is one that ​ (a)   light.

• reflects
• produces
• rejects

A luminous object is one that ​ (a)   light.

• produces
• reflects
• rejects

Objects ​ (a)   are called

sources of light (luminous objects).

• which give out light
• which receive light
• which leave the light to go through
• which leave the light pass through
• which allow the light pass through

Light travels much _​ (a)   than sound.

• faster
• slower

1)Thunder and lightning start at the same time, but we will ​ (a)   .

• see the lightning first
• hear the thunder first
• see the lightening and hear the thunder together.

Light travels VERY FAST – around ​ (a)   kilometres per second.

• 300,000
• 3000,000
• 30,000