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what is aforce

• push

• pull

• both

• none

example for a contact force

Light is a form of energy that causes the sensation of

• hearing

• smell

• sight

• touch

Luminous means

• Objects that are in space

• Objects that give their own light

• Objects that are shiny

• Objects that are very huge

What is the phenomenon of light emission by a substance after the absorption of energy?

• Reflection

• Refraction

• Fluorescence

• Incandescence

Which of the following is a primary color of light?

• Red

• Yellow

• Green

• White

What is the speed of light in a vacuum?

• 299,792,458 meters per second

• 300,000,000 meters per second

• 299,792,458 kilometers per second

• 300,000,000 kilometers per second