Light, Heat and Sound

When is the sound made?

• When an object travels in space.

• When an object hits another object.

• When an object moves back and forth.

• When there is air around.

When we are in the classroom, which of the following sound may reach our ears first?

• Sound from tapping the table.

• Ring of the bell from the principal’s office.

• Whisper of your classmate seated behind the room.

• Chirps of a bird nearby acacia tree.

Without vibration, the sound is not produced. It refers to where the sound is made

• a source

• a medium

• a receiver

These are the imaginary waves produced when an object vibrates.

• vibration

• sound waves

• echo

Sound waves travel very slowly in the air.

• TRUE

• FALSE

What energy transfer is shown through direct contact of the heat source and the body receiving the heat?

• CONDUCTION

• CONVECTION

• RADIATION

• HEAT

Which picture shows radiation?

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• 
• 

A transfer of heat through air and water is called __________________.

• conduction

• convection

• radiation

• heat

Which situations show conduction?

• ice melting in your hands

• butter on top of the hot pancake

• ironing your clothes

• all of the above

This heat transfer travels across in a space or a vacuum through waves

• conduction

• convection

• radiation

• sound waves