Light travel through space at a constant speed of about 3×10^5km/s earth is about 1.5×10^8km from the sun how long does it take for light from the sun to reach earth?

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Answer 1 · 2018-04-14T08:23:06

500 seconds

Divide the distance by the speed to find the time

#[1.5xx10^8]/(3xx10^5)# =#0.5xx10^3#=500 secs

If you struggle with scientific notation

#[150,000,000]/(300,000)#=#[1500]/3#=500

Answer 2 · 2018-04-14T08:28:07

#"Time"= 500" s"#

Starting with the equation:

#"Distance" = "Speed" xx "Time"#

We shall solve the equation for #"Time"# in terms of #"Distance"# and #"Speed"#:

#"Time"= "Distance"/"Speed"#

Substitute #"Distance" = 1.5xx10^8" km"# and #"Speed" = 3xx10^5" km/s"#

#"Time"= (1.5xx10^8" km")/(3xx10^5" km/s")#

#"Time"= 500" s"#

Answer 3 · 2018-04-14T08:35:20

500 Seconds

Distance = Speed x Time
Time = Distance/Speed
#t=(1.5*10^8)/(3*10^5)#
#t=(10^3)/2#
#t=500# Seconds