An observer sees an asteroid with a radioactive element moving by at a speed of 0.20c and

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An observer sees an asteroid with a radioactive element moving by at a speed of 0.20c and notes that the half-life of the radioactivity is T. Another observer is moving with the asteroid and measures the halflife to be 

(a) Less than T.

(b) equal to T.
(c) Greater than T.
(d) Either (a) or (c) depending on whether the asteroid is approaching or receding from the first observer.

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