Sound and light revision

Select all the examples that show uses of light energy

• The sound coming out of a speaker

• The warmth you feel in a hot day

• Heating water by using the Sun's rays

• Using a flashlight when it is dark

A solar cell is a __________________

• an electromagnetic radiation.

• device that uses light from the Sun to produce electricity.

• tiny particle of energy.

What is a medium?

• The substance where energy travels.

• A back and forth motion.

• It is matter.

Select the media where sound can travel

• Solid

• Vacuum

• Liquid

• Gas

Light can travel __________________

• only with a medium.

• with or without a medium.

• only without a medium.

What travels the fastest in vacuum?

• Sound

• Electricity

• Light

Which is the main source of light energy on Earth?

• Lamp

• Bulb

• Sun

• Chandelier

what is a another for word for mandmade light

• artifcial light

• handmade light

• pepole who made light

• men that make human made light

The back and forth (or side to side motion of a wave) is called...

• Transverse wave
• Longitudinal wave
• Sound wave
• Electromagnetic wave

why is sound faster under water than on land ?

• water particals are packed more densly causing a better sound

• because water is more quiet and you can hear better

• because there is no loud sounds in the water but on land there is alot sounds and you won,t be able to hear easilly

• because water has more particls that sound can vibrate and you will be able to here very cleary of the partcils vibrateing .