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?

Question

3293 views around the world

You can reuse this answer
Creative Commons License

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