NEET UG PHYSICS MCQ: NUCLEI

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Understanding +4 | -1

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

View answer and explanation

Correct option: A

{T_B} < {T_A}

Time dilation occurs in special relativity, so the observer A will measure a longer decay time than observer B, hence

{T_B} < {T_A}

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