Time dilation due to relative velocity
$$\Delta_{t_r} = \frac{\Delta_{t}}{\sqrt {1-\frac{v^{2}}{c^{2}}}}$$
Δt_r - time interval in observer system
Δt - time interval in moving system
v - speed (velocity)
c - speed of light
Δt - time interval in moving system
v - speed (velocity)
c - speed of light
Find
It is known that:
= 