UNIT 5 5º

This lamp transforms electrical energy to light energy

• True

• False

Artificial light is always man-made

• True

• False

Which are natural light sources?

• the Northern Lights

• The sun

• Lamps

• Phones

Look at the pictures. What causes rainbows?

• Reflection

• Refraction

• Absorption

• Sound

Look at the picture. What can you see?

• man-made light

• electrical energy

• reflection

• bioluminescence

Sound can travel through a vacuum

• true

• false

Which two ways can heat change states of matter?

• Freezing

• Melting

• Condensation

• Evaporation

Which two things happen when something is heated?

• Expansion

• Contraction

• Increased (+) temperature

• Decreased (-) temperature

We hear large vibrations as loud sounds

• true

• false

Choose the correct

• sound travels faster than light

• light travels in straight lines and sound travels in sound waves

• sound travels faster through air than through water

• light travels in straight lines, but sound travels faster