SPEED OF LIGHT

How fast is Light speed

• about 2,000,000 km/h

• exactly 299,792,458 m/sec

• teleportation

• exactly 298,450,378 h/sec

The distance light can travel in one year is ______________

• 15,000 kilometers

• 1 light-year

• 15 Astronomical Units

• 6,000 miles

Scientists use the light-year to describe the relationships between objects in space. What does a light-year measure?

• the distance that light can travel in one year

• the brightness of light that travels through space

• the number of years it takes light to travel to Earth

• the time it takes light to travel 1 million km

Proxima Centauri is ______ light years away.

• 6.8

• 2.5

• 4.3

• 5.4

The moon is a ______ a light year

• closer than

• farther than

• exactly

• not aplicable

If a satellite is 600,000,000 meters from the earth how long would it take a signal traveling at the speed of light to reach earth?

• 1 sec

• 0.5 sec

• 2 sec

• more than 3 sec

Radiation from the Sun is traveling to earth at the speed of light if the sun is 150,000,000,000 meters away how long would it take to reach the earth?

• 500 sec

• 100 sec

• 50 sec

• less than 5 sec

Light years measure

• time

• distance

• light intensity

• gravity

Which is not closer than a light year

• Moon

• Stars

• Pluto

• Hubble telescope

• Sun

What is the distance of one Light year

• 9,500,000 km

• 95,000,000,000,000