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Nucleus: Introduction

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the activity of a radioactive sample os measured as No counts per min at t=0 and No/e counts per min at t=5 mins. the time in min at which the activity reduces to half its value is

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Q. The activity of a radioactive sample is measured as

N_{0}

counts per minute at

t = 0

N_{0} / e

counts per minute at

t = 5

min. The time, (in minute) at which the activity reduces to half its value, is :

Q. The activity of a radioactive sample is measured as 9750 count/min at t = 0 and 975 count/min at t = 5 min.The decay constant is nearly

Q. The initial activity of a certain radioactive isotopes was measured as

16000

m i n^{- 1}

. Given that the only activity measured was due to this isotopes and that its activity after

12 h

2100

m i n^{- 1}

, its half-life, in hours, is nearest to [Given

l o g_{e} (7.2) = 2]

Q. The activity of radioactive sample is measured as

9750

counts per minute at

t = 0

975

counts per minute at

t = 5

minutes, the decay constant is approximately

Q. An artificial element shows activity of 12.5 cps(counts per second) at its formation as recorded in a G.M. counter. After 10 min activity is 7.5 cps. In the absence of element, G.M.counter records activity 0f 2.5 cps. What is its half life period ?

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