Which statement regarding nuclear decay is correct?

The half-life of an element is the time it takes for an average of 50 percent of the atoms in a sample to decay.

All radioactive elements have the same half-life and decay at the same speed.

Atoms of a radioactive sample that did not decay in the first half-life are more likely to decay than they were previously.

For a sample of element A, with a half-life of six minutes, all radiation would be gone from the sample by twelve minutes.

Question

Which statement regarding nuclear decay is correct?
		
The half-life of an element is the time it takes for an average of 50 percent of the atoms in a sample to decay.
		
All radioactive elements have the same half-life and decay at the same speed.
		
Atoms of a radioactive sample that did not decay in the first half-life are more likely to decay than they were previously.
		
For a sample of element A, with a half-life of six minutes, all radiation would be gone from the sample by twelve minutes.

nvidiaintely · Answer

this one idk haha

kevin · Answer

Well, this time needs time to answer :D

agent0smith · Answer

Three of them are complete nonsense, and one is the definition of half life.

kevin · Answer

It's likely C.. but let's wait for the other answer

kevin · Answer

@agent0smith what do you think?

nvidiaintely · Answer

@welshfella

agent0smith · Answer

I gave what I think above... read it, you might figure it out from that.

nvidiaintely · Answer

Yeah

nvidiaintely · Answer

Its A

kevin · Answer

I change my mind, it's A

nvidiaintely · Answer

The half-life of an element is the time it takes for an average of 50 percent of the atoms in a sample to decay.

welshfella · Answer

that is correct