The time that would take a radio wave with the frequency of 7.25 x 10^5 Hz to travel from earth to the moon is 1.28 sec
Calculation
Time = distance / speed
distance = 3.84 x 10 ^5 km
convert Km to m
1 Km= 1000 m
3.84 x10^5km= ? m
by cross multiplication
= (3.84 x 10^5 km x 1000 m) / 1 km = 3.84 x 10 ^8 m
Speed of light= 3.0 x 10^8 m/s
therefore time = 3.84 x10^8 m / 3.0 x10^8 m/s = 1.28 sec
