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The count rate of a Geiger Muller counter for the radiation of a radioactive material of half-life 30 minutes decreases to 5 sec^-1 after 2 hours. The initial count rate was

(a) 20 sec^-1

(b) 25 sec^-1

(c) 80 sec^-1

(d) 625 sec^-1

Navjyot Kalra , 12 Years ago

Grade 10

1 Answers

Navjyot Kalra

(c)

Half-life = 30minutes; Rate of decrease (N) = 5 per second and total time = 2 hours = 120 minutes.

Relation for initial and final count rate

Last Activity: 12 Years ago

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Modern Physics> geiger-muller-counter...

The count rate of a Geiger Muller counter for the radiation of a radioactive material of half-life 30 minutes decreases to 5 sec-1 after 2 hours. The initial count rate was (a) 20 sec-1 (b) 25 sec-1 (c) 80 sec-1 (d) 625 sec-1

Navjyot Kalra , 12 Years ago

Navjyot Kalra

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The count rate of a Geiger Muller counter for the radiation of a radioactive material of half-life 30 minutes decreases to 5 sec^-1 after 2 hours. The initial count rate was

(a) 20 sec^-1

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