Write in one word:

Objects that give out light

Write in one word:

Objects that do not give out light

Write in one word:

A form of energy caused when objects vibrate

Write in one word:

Sound that is loud or unpleasant to the ear

The ________ is the most important source of light for the earth.

• sun

• moon

_________ are artificial sources of light.

• Stars

• Electric bulbs

__________ are non-luminous objects.

• Trees

• Lamps

The sound of ________ is pleasant to the ear.

• music

• traffic

………… is an object which has its own light.

We can control the light of an …………………… source of light.