7a-units Radioactivity and particles

Question 1

Radioactivity (Activity)
Unit

Answer 1

Radioactivity (Activity)

Becquerel

Bq

Question 2

what does Becquerel (Bq)

Answer 2

Becquerel (Bq): Measures the activity of a radioactive source; 1 Bq = 1 decay per second.

Question 3

Activity Equation:

Answer 3

A=N/t (Activity = Number of decays ÷ Time)

Question 4

Half-Life Calculations:

Answer 4

Half-Life Calculations:
N= N(0) x (1/2)^n

(Remaining nuclei = Initial nuclei × (1/2)ⁿ, where = number of half-lives passed)

Question 5

Converting Time for Half-Life:

Answer 5

If half-life is in minutes, convert to seconds before using in calculations.

If half-life is in hours, multiply by 3600 to convert to seconds.

Question 6

Practical: Measuring Radioactive Decay

Measuring Radioactivity Over Time

Answer 6

Method: Use a Geiger-Müller tube to measure count rate at regular time intervals.

Observation: Activity decreases over time, following an exponential decay pattern.

Conclusion: Calculate half-life by plotting a graph of activity vs. time.