A robot sent to the moon sends a laser light towards the earth. If it takes $13$ seconds to reach the earth then calculate the distance between moon and the earth in kilometres.
(Given : Velocity of light is $3 \times 10^{8} m / s$ )

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Solution

Given : Velocity $v = 3 \times 10^{8} m / s$
Time $t = 1.3 s e c o n d s$
Formula: $d = v \times t$
Substitution : $d = 3 \times 10^{8} \times 1.3$
$= 3.9 \times 10^{8} m$
$= 3.9 \times 10^{5} k m$
Final answer : Distance between the moon and the earth is $3.9 \times 10^{5} k m$

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A robot sent to the moon sends a laser light towards the earth. If it takes 13 seconds to reach the earth then calculate the distance between moon and the earth in kilometres.(Given : Velocity of light is 3×108m/s)

Given : Velocity v=3×108m/sTime t=1.3 secondsFormula: d=v×tSubstitution : d=3×108×1.3=3.9×108m=3.9×105kmFinal answer : Distance between the moon and the earth is 3.9×105km

A robot sent to the moon sends a laser light towards the earth. If it takes $13$ seconds to reach the earth then calculate the distance between moon and the earth in kilometres.
(Given : Velocity of light is $3 \times 10^{8} m / s$ )

Given : Velocity $v = 3 \times 10^{8} m / s$
Time $t = 1.3 s e c o n d s$
Formula: $d = v \times t$
Substitution : $d = 3 \times 10^{8} \times 1.3$
$= 3.9 \times 10^{8} m$
$= 3.9 \times 10^{5} k m$
Final answer : Distance between the moon and the earth is $3.9 \times 10^{5} k m$