The count rate of a Geiger Muller counter for the radiation of a radioactive material of half-life $30$ min decreases to $5 s^{- 1}$ after $2 h$ . The initial count rate was

20 s^{- 1}

25 s^{- 1}

80 s^{- 1}

625 s^{- 1}

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The count rate of a Geiger Muller counter for the radiation of a radioactive material of half-life

30

min decreases to

5 s^{- 1}

after

2 h

. The initial count rate was

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Question Text

The count rate of a Geiger Muller counter for the radiation of a radioactive material of half-life

30

min decreases to

5 s^{- 1}

after

2 h

. The initial count rate was

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