Question

An observer $A$ sees an asteroid with a radioactive element moving by at a speed $ = 0.3\,\,c$ and measures the radioactivity decay time to be ${T_A}$. Another observer $B$ is moving with the asteroid and measures its decay time as ${T_B}$. Then ${T_A}$ and ${T_B}$ are related as below

Accepted Answer

${T_B} < {T_A}$

Answer

${T_B} = {T_A}$

Answer

${T_B} > {T_A}$

Answer

Either (1) or (3) depending on whether the asteroid is approaching or moving away from $A$

JEE PHYSICS MCQ: NUCLEI

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