Register
A potassium-40 sample starts with 50 atoms, and 1.25 billion years later, there are 25 atoms. What is the half-life of potassium-40? A. 2.5 billion years B. 25 years C. 40 years D. 1.25 billion years
69.5k views
5 votes
A potassium-40 sample starts with 50 atoms, and 1.25 billion years later, there are 25 atoms. What is the half-life of potassium-40?

A. 2.5 billion years
B. 25 years
C. 40 years
D. 1.25 billion years

User Prithvi Raj
by
4.2k points

1 Answer

7 votes
D. 1.25 billion years
User Mohib Sheth
by
4.8k points
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

4.7m questions

6.1m answers

Other Questions

Which option describes nonmetals?
30 POINTS! PLEASE HELP There are people who believe that the left brain is the more important hemisphere and needs to be developed as much as possible since it reflects the values that need to be increased
What does measurement mean
A solution is made by dissolving 2.3 moles of sodium chloride (NaCl) in 0.155 kilograms of water. If the molal boiling point constant for water (Kb) is 0.51 °C/m, what would be the boiling point of this
Which statement is a valid conclusion about the activation energy of the reverse reaction if the forward reaction is exothermic? a ) The activation energy of the reverse reaction is the same as that of
Link Copied!