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Fiesta28 [93]
2 years ago
6

25 POINTS please help!

Physics
2 answers:
salantis [7]2 years ago
7 0

Answer: b

Explanation:

kow [346]2 years ago
3 0

Answer:

b

Explanation:

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3 years ago
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2.5 gram sample of a radioactive element was formed in a 1960 explosion of an atomic bomb at Johnson Island in the Pacific Test
kow [346]

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0.15625 grams

Explanation:

Half life: It is related to the decay of radioactive material. The duration in which  half of the material will be degraded/decayed. That means after half life 50% of the radioactive material will be left. Here the half life is 28 years.

Initial quantity of the sample: 2.5 grams.

After 28 years, the leftover quantity = 1.25 grams

After 56 years, the leftover quantity = 0.625 grams

After 84 Years, the leftover quantity = 0.3125 grams

After 112 years, the leftover quantity = 0.15625 grams

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3 years ago
Which of these is an example of a chemical change?
xenn [34]

Hello!  B. would be an example of a chemical change.

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