Space - HSC Help (1 Viewer)

[User-Dependent]

Any help is appreciated with the following question I can't manage to do;

A spaceship flies past a planet at .6c. The pilot + his girlfriend on the planet each wave @ the other for 4.0 seconds.

Calculate how long the pilot sees his girlfriend waving.

The answer supplied is 3.2 seconds, which I don't know how to reach. Any help again - thanks.

 

[Aerath]

Or, since it says 0.6c, you can just sub that in for (v/c) straight away.

T_o = T_v(1- (0.6)²)^0.5
T_o = 4(1- (0.6)²)^0.5
T_o = 4(0.8)
T_o = 3.2s