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marysya [2.9K]
3 years ago
7

A) How long will it take for 40.0 grams of Radium-226 (Ra-226) to decay to leave a total of 2.5 grams of Ra-226? Ra-226 has a ha

lf-life of 1600 years.
B) If there are 80.0 grams of Neptunium-240 (Np-240), how much Neptunium-240 will remain after 4 hours? The half-life of Neptunium-24 is 1 hour.
Biology
2 answers:
kumpel [21]3 years ago
8 0

Answer:

a) 6400 years

b) 5 grams

Explanation:

a) to get 6400 years, the 40 grams is halved 4 times to get to 2.5g and 4 times 1600 is 6400

b) 80 is halved 4 times and the final result you get is 5 grams

80/2= 40/2= 20/2=10/2=5

each divided by 2 represents 1 hour

sergey [27]3 years ago
4 0

Answer:

[ A ] 6400 years

[ B ] 5 grams

Explanation:

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A structure called a sporangium is found in some plants and other creatures and is responsible for producing and storing spores. Spores, haploid structures produced by organisms, aid in germination and the development of new species. They assist in the process of reproduction, in other words. What does it actually imply that they are haploid, though? Simply said, it indicates that there are just half the chromosomes needed to create a complete diploid creature. The sporangia can divide through mitosis, or cell division, to manufacture and release spores.

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