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JEE Advanced 2021 Full Test 1 Paper 1

(One or More than one correct type)
This section contains 06 multiple choice questions. Each question has FOUR options (A), (B), (C) and(D). ONE OR MORE THAN ONE of these four options is(are) correct.

Question : 8

Total: 54

A radioactive point source has a decay constant λ . When this source moves towards small area counter kept at large distance from source, then counter records count/second which turns out to be constant:

When separation between source and counter becomes half of initial value, number of nuclei left undecayed will be
3
4
th of initial value
When separation between source and counter becomes half of initial value, number of nuclei left undecayed will be
1
4
th of initial value
Graph showing variation of separation between source and counter with time is as shown
Graph showing variation of separation between source and counter with time is as shown

Validate

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