Four seismometers stations are the minimum needed to calculate the epicenter of an earthquake.
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- Initial velocity=u=0m/s
- Acceleration=a=3m/s^2
Time not needed now
Case-1:-
- Time=1s
- Final velocity=v
Case-2:-
- Time=3s
Case-3:-
- Time=25s
From the activity values and the decay constant, the mass of of Strontium in the sample is:
The decay constant of an element is the probability of decay of a nucleus per unit time.
{λ = ln 2 / t1/2
where;
t1/2 is the half-life of the isotope.
The half-life is converted to seconds since the decay constant is asked in per seconds.
Hence;
The activity of the element, A, the decay constant, λ and the number of nuclei, N are related as follows:
- A = (–) λN
Molar mass of Strontium-90 is 90 g.
1 mole of Strontium-90 contains 6.02×10^23 nuclei.
The mass, m of Strontium in the sample is calculated:
Therefore, the mass of of Strontium in the sample is:
Learn more about decay constant at: brainly.com/question/17159453
Here is your answer
REASON :
We know that
Potential difference, V= W/q
where, W is work done
and, q is magnitude of charge
Given,
V= 9.0 v and W= 45 J
So,
using above relation, we get
9= 45/q
q= 45/9
q= 5 coulomb
HOPE IT IS USEFUL