Total time taken by a laser beam to return to the earth after reflection from the moon is 2.56 s. Calculate the distance of moon from the earth. Take velocity of light in vacuum `=3xx10^8m//s.`

Answer

`3.84xx10^km`

Explanation

Here, `t = 2.56s, r = ? C=3xx10^8m//s`
AS `r = cxx(t)/(2)`
`:. r= 3xx10^8xx(2.56)/(2) = 3.84xx10^8m`
`=3.84 xx10^5 km.