There is a 50 g sample of ra-229. it has a half-life of 4 minutes.
how much will be left after 12 minutes?

Via half-life equation we have:

Where the initial amount is 50 grams, half-life is 4 minutes, and time elapsed is 12 minutes.  By plugging those values in we get:

There is 6.25 grams left of Ra-229 after 12 minutes.

question1

1,000 tons

question2

3: 8

question 3

store d

step-by-step explanation:

so easy. just google the electromagnetic waves and it’ll pop up.