Home
Class 12
CHEMISTRY
The counting rate observed from a radioa...

The counting rate observed from a radioactive source at t = 0 seconds was 1600 counts / sec and at t = 8 sec it was 100 counts /sec . The counting rate obserbed as count per sec at t = 6 sec will be

A

400

B

300

C

200

D

150

Text Solution

Verified by Experts

The correct Answer is:
C
`lambda xx 8 = 2.303 log ((600)/(100)) , lambda = (2.303)/(8) xx 4 log (2) = (2.303 xx 4 xx 0.3010)/(8) = (0.693)/(2)`
`t_(1//2) = (0.693)/(lambda) = (0.693)/(0.693//2) = 2` sec , `1600 overset(2) (to) 800 overset(2)(to) 400 overset(2) (to) 200 , T = 6`
Promotional Banner

Topper's Solved these Questions

  • NUCLEAR CHEMISTRY

    AAKASH SERIES|Exercise LECTURE SHEET (LEVEL- II) (EXERCISE - II) (Linked Comprehension type questions)|9 Videos

  • NUCLEAR CHEMISTRY

    AAKASH SERIES|Exercise LECTURE SHEET (LEVEL- II) (EXERCISE - III) (Match the following questions )|3 Videos

  • NOBLE GASES

    AAKASH SERIES|Exercise PRACTICE SHEET - 2 (Single more than one option questions)|5 Videos

  • PERIODIC TABLE

    AAKASH SERIES|Exercise QUESTIONS FOR DESCRIPTIVE ANSWERS|37 Videos

Similar Questions

Explore conceptually related problems

The count rate from a radioactive sample falls from 4.0 xx 10^(6) per second to 1.0 xx 10^(6) per second in 20 hours. What will be the count rate 100 hours after the beginning?

Decay constant of a radioactive substance is 69.3 sec^(-1) , find t_(1//16) of the same substance

A certain sample of a radioactive material decays at the rate of 500 per second at a certain time. The count rate falls to 200 per second after 50 minutes. (a) What is the decay constant of the sample ? (b) What is its half-life?

The radioactive decay rate of a radioactive element is found to be 10^(3) dps at a certain time . If the half life of element is 1 sec , the decay rate after 1 sec , is ….and after 3 sec , is …….