destinysmithds7040 destinysmithds7040

17-01-2022
Biology

contestada

4 PTS

What percent of uranium-235 remains after 1420 million years?

A)

12.5%

B)

25%

C)

40%

D

75%

Respuesta :

chibabykalu16 chibabykalu16

19-01-2022

Answer:

B) 25% but to be exact 24.7%

Explanation:

The halflife of 235U is 704 million years. 1420 million years is approximately two halflives, so about 24.7% would be remaining.

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