Question

- A flash bulb is located at a distance 30 km from an observer. The bulb is fired and
the observer sees the bulb at 13:00 Hrs. What is actual time that the bulb is fired?​

Answer 1

Speed of the light is 3x 10power 8 meters per sec . So time taken to cover 30 km is given by

VT =S
3x10power5 x T = 30
T = 10power-4 seconds
So the bulb is fired at
13 hrs - 10power-4 seconds
i.e 12 hrs 59min 59.0006 seconds