Question

A radioactive element gets spilled over the floor of a room. Its half-life period is 30 days. If the initial velocity is ten times the permissible value, after how many days will it be safe to enter the room?
(a) 100 days
(b) 1000 days
(c) 300 days
(d) 10 days.

Answer 1

hi friend.....

Correct option (a) 100 days

Explanation....

reffered to the attached file......


hope I answered your question.....

Answer 2

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HERE IS UR ANSWER

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option A is correct !!