Light

What is Light?

• Light is a type of energy that travels as a wave.– Electromagnetic Wave– Type of wave that does not need a medium to

travel– Light is able to travel through space

Speed of Light

• Light travels at 300,000 km/sec– 18,000,000 km/m– 1,080,000,000 km/h– 25,920,000,000 km/day– 9,460,800,000,000 km/year

• A light year is the distance that light can travel in one year

• At this speed you could travel around the Earth 7.5 times in 1 second

Light from the Sun

• Light from the sun takes 8.3 minutes to reach Earth• The Earth is 150,000,000 km away from the sun• Electromagnetic waves from the sun are major sources

of energy on earth• Plants use this energy to feed themselves and grow.• Animals in turn take this energy when they eat the

plants• The Earth’s fossil fuels are stored energy from the sun