Sound and Light

Astronauts in space cannot talk to each other unless they use a radio to speak back and forth. Why is this?

• The air is too thick to carry sound waves efficiently

• The force of gravity is too strong to allow sound waves to travel.

• There is no air in space, so there is no medium to carry sound waves.

• It is very loud in space, so they can only hear each other through a radio.

A fire truck's siren and flashing lights are examples of __ and __ energy. Choose two answers.

• heat - nuclear

• light - heat

• chemical - nuclear

• sound - light

Sound waves travel the fastest through

• solids

• liquids

• gases

• vacuum

Why are sounds not heard in space?

• Space is too cold for sound waves to travel.

• There is too much matter to travel through in space.

• Space is a vacuum with few particles to travel through.

• Energy cannot travel in space.

How does sound energy travel?

• in vacuum

• in beams

• in pulses

• in waves

Light travels as tiny ____________of energy.

• holes

• photons

• stripes

• space

A pom-pom launcher ________

• transfers kinetic energy to thermal energy

• transforms kinetic energy to sound energy

• transforms stored energy to energy of motion

• transfers energy of motion to stored energy

In the photovoltaic cells energy transforms from ____to_____

• light - electrical

• light - sound

• electrical - light

• electrical - sound

light is faster than sound because___________

• it can travel through air only.

• it is made of particles.

• it doesn't need medium to carry it.

• it transfers by vibrations.

in the air, ________________

• light travels faster while sound travels slower.

• sound travels faster while light travels slower.