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In 1969, apollo 11 astronauts placed a special reflector on the moon. this reflector sends light back in the direction from which it came, regardless of its angle of incidence. With the moon about 384000 km from the earth, how long would it take a light pules sent back from earth to reach the lunar reflector and then return to earth?

 Jun 15, 2015

Best Answer 

 #1
avatar+129845 
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The speed of light is about 299,792,458 m/s

 

And  394,000km =   384,000,000m...... and since the light beam must travel twice this distance, we have.......

 

Distance / Rate = Time   ......         2(384,000,000) / 299,792,458  =  about 2.56 sec

 

 

 

 Jun 16, 2015

1+0 Answers

 #1
avatar+129845 
+10
Best Answer

The speed of light is about 299,792,458 m/s

 

And  394,000km =   384,000,000m...... and since the light beam must travel twice this distance, we have.......

 

Distance / Rate = Time   ......         2(384,000,000) / 299,792,458  =  about 2.56 sec

 

 

 

CPhill Jun 16, 2015

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