Tamil Nadu Board of Secondary EducationHSC Science Class 12th

# What is meant by activity or decay rate? Give its unit. - Physics

Short Note

What is meant by activity or decay rate? Give its unit.

#### Solution

Activity (R) or decay rate which is the number of nuclei decayed per second and it is denoted as

R = |"dN"/"dt"|

R = |"dN"/"dt"| = λN0e-λt

R = R0e-λt

The SI unit of activity R is Becquerel and one Becquerel (Bq) is equal to one decay per second. There is also another standard unit for the activity called Curie (Ci).

1 Curie = 1 Ci = 3.7 × 1010 decays per second

1 Ci = 3.7 × 1010 Bq

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#### APPEARS IN

Tamil Nadu Board Samacheer Kalvi Class 12th Physics Volume 1 and 2 Answers Guide
Chapter 9 Atomic and Nuclear physics
Evaluation | Q II. 25. | Page 191
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