Look at the graph for A. The activity falls from 120 to 60 in 8 seconds. That means 8 seconds is one half life because that's how long it takes the activity to fall to half the original value. That means, every 8 seconds the activity halves. So after 8 seconds its activity is 60 After another 8 seconds (=16 seconds) the activity will halve again. (to 30) What will it be after 24 seconds?
Look at the graph for A. The activity falls from 120 to 60 in 8 seconds. That means 8 seconds is one half life because that's how long it takes the activity to fall to half the original value. That means, every 8 seconds the activity halves. So after 8 seconds its activity is 60 After another 8 seconds (=16 seconds) the activity will halve again. (to 30) What will it be after 24 seconds?
15.
I'm getting confused with Becquerel and count rate please can u define it.
I'm getting confused with Becquerel and count rate please can u define it.
Becquerel is a measure of activity and is the number of disintegrations per second. Count rate (from a detector) gives a measure of how the activity of a sample is varying.
Count rate does not equal activity in becquerel because the detector will not detect all the disintegrations. However, count rate is a measure of activity. If the count rate drops to half then the activity of the sample has dropped to half. That's what is happening in this question. The count rate tells us the activity has fallen to half after 8 seconds. It does not tell us the activity in becquerel, though.