What percent of potassium-40 remains undecayed in a rock that is 3.9 billion years old? The 3.9 billion year old rock has undergone three half-lives (3.9 divided by 1.3 = 3). After 3 half-lives, 12.5% of the potassium-40 remains undecayed.
Answer: 29.5 days
Hi, i got this answer in my class cause we actually did the same thing.
Hi, friend!
The Answer is Mechanical energy!
Match each form of Energy with it's definition. The sum of an object's kinetic and potential energies?
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Answer:
the answer is a. any ciliated cell in lungs catches bacteria & debris from lungs causing cough, difficulty breathing, etc.
can develop into asthma, infection of pleura, and bronchitis...
Answer:
how a freshwater ecosystem, such as a pond, can change into a terrestrial ecosystem.how a freshwater ecosystem, such as a pond, can change into a terrestrial ecosystem.how a freshwater ecosystem, such as a pond, can change into a terrestrial ecosystem.how a freshwater ecosystem, such as a pond, can change into a terrestrial ecosystem.
Explanation:
