It is b i had that qustion
The answer is: The addition of a small dense nucleus at the center of the atom.
Answer:
Explanation:
Let's use the decay equation.
Where:
- A is the activity at t time
- A₀ is the initial activity
- λ is the decay constant
We know that 
So we have:
Therefore, the half-life of the source is 6 hours.
I hope it helps you!
Each resistor has the same voltage across it, and Current=(voltage)/(resistance).
The lowest resistance has the highest current through it. That's the 4-ohm unit.
Answer:
<h2>Gravity :</h2><h3>the force that attracts a body towards the centre of the earth, or towards any other physical body having mass.</h3>
<h2>Solar day</h2><h3>A solar day is the time it takes for the Earth to rotate about its axis so that the Sun appears in the same position in the sky.</h3><h2> or</h2><h3>It is the time between successive meridian transits of the sun at a particular place.</h3>
