Particles stay the same unless there is a chemical change whether the matter is solid, liquid or gas. ... When substances change state there is no change in mass so if 100 g of ice is melted 100g of water are formed this will boil to form 100g of steam (this is called "conservation of mass").
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!
Answer:
Because of the way light bounces off of objects.
<span>The part of the electromagnetic spectrum that is necessary for the sense of sight in humans is called visible light. This portion of the electromagnetic spectrum is composed of the various colors that the human eyes can distinguish. Each color has a corresponding wavelength. The human eyes can see wavelengths between 390-700 nm, and visible light ranges from 380-750 nm.</span>
Well, each of them is more complicated that the typical average Brainly question. But yes, with some time and effort invested, I believe I could answer all three.
