Question

In determining the distance to a cloud, a meteorologist in a tv station uses radar and notes that a time of 0.2 ms elapses between the sending and return of a radar pulse. how far away is the cloud?

Answer 1

take the speed of light as 3.00*10^8 m/s
d=vt
d=(300000000*0.002 seconds)/2 (as this is twice the distance to the cloud)
d=300000m
300km