Question

There are 200 particles of a certain atom in a chamber. If you know that this atom has a half-life of 4 minutes, how many particles will still be radioactive after 4 minutes? Select the best answer
A. about 25
B. about 50
C. about 100
D. about 200

Answer 1

C. about 100
Final Answer.

Answer 2

Assume you have two radioactive samples (each has the same number of particles). You leave both samples sitting overnight. In the morning, Sample A has no radioactive particles remaining, while Sample B is still noticeably radioactive.
This experiment is done many times with the same result. Which sample has a longer half life?
A. Sample A
B. Sample B
C. More information is needed
D. Both have the same half life

Answer 3

B. Sample B

Answer 4

Out of 5 undisturbed horizontal beds of sedimentary rock, we can say that _______________.
A. the top layer is oldest
B. the lowest layer is oldest
C. there is no way of knowing which is oldest
D. the 2nd and 3rd are younger than the top layer.
2 more

Answer 5

i was thinking C

Answer 6

Sorry for the late response.
I have frostbite on my finger :(
The answer would be
B. the lowest layer is oldest

Answer 7

ohh frostbite??

Answer 8

Frostbite:
Injury to body tissues caused by exposure to extreme cold, often resulting in gangrene.

Answer 9

OMG ur smart

Answer 10

The largest subdivisions are ___________.
A. eons
B. epochs
C. eras
D. periods

Answer 11

A. eons

Answer 12

thx