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The kind of heat transfer that travels through space in electromagnetic waves is ______________________.

• insulation.
• Radiation
• Conduction
• Convection

The type of heat transfer that happens through direct contact of molecules or particles with each other is ___________________.

• Convection
• Conduction
• Radiation
• insulation.

___________________ is the type of heat transfer that occurs in fluids, such as warm air rising and cold air sinking; creating wind.

• Convection
• Conduction
• Radiation
• insulation.

Two objects at different temperatures are in contact. Which of the following happens to their thermal energy?

• Their thermal energies remain the same.
• Thermal energy passes from the cooler object to the warmer object
• Thermal energy passes from the warmer object to the cooler object.
• Thermal energy passes back and forth equally between the two objects.

Which wave has a longer wavelength?

• A

• B

The __________ of a wave is the number of waves that pass a given point in one second.

• amplitude

• wavelength

• frequency

• period

If an object allows most all light to pass through it then it is...

• transparent
• opaque 
• translucent
• cold

An object that blocks all of the light from passing through is...

• transparent

• clear

• opaque

• translucent

This type of object lets some light through, but not all. It is not easy to see through this type of material.

• transparent

• translucent

• co-parent

• opaque

Reflection is when light...

• Bends

• Bounces

• Absorbs

• transmits