suppose you start with 1 kilogram of a radioactive substance that has a half-life of 10 years. which of the following statements will be true after 20 years pass?
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suppose you start with 1 kilogram of a radioactive substance that has a half-life of 10 years. which of the following statements will be true after 20 years pass?
After all, the speed of light is a huge number (186,000 miles per second or 300,000 km/s). And, in Einstein’s famous equation, that huge number is squared. So it doesn’t take much mathematical skill to see that a tiny mass can equal big energy. E=mc2 explains why the sun and other stars shine.
Suppose you start with 1 kilogram of a radioactive substance that has a half-life of 10 years. Which of the following statements will be true after 20 years pass?
You’ll have 0.25 kilogram of the radioactive substance remaining.