speed of Rocket=0.500c
Rate of light signal=2100 flahes/min
Using time dilation equation
t=to1−v2c2t=\frac{t_o}{\sqrt{1-\frac{v^2}{c^2}}}t=1−c2v2to
=11−0.25c2c2\frac{1}{\sqrt{1-\frac{0.25c^2}{c^2}}}1−c20.25c21
=10.75\frac{1}{\sqrt{0.75}}0.751
=1.154 min
Number .of flashes seen in 1.154 min=1.154×21001.154\times 21001.154×2100
=2423.4
i.e. approx 2432 flashes/min
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