Answer:
D. Increase in UV radiation
Explanation:
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Cs -137 has a half life of about 30 years. If 60 years pass, there is two half lives passed so 1/2 * 1/2= 1/4. Take 1/4 and multiply it with the mass given:
(1/4)*20mg=5mg left
Answer:
126.4 g of
are required
Explanation:
Balanced reaction: 
According to balanced reaction-
8 moles of
are produced from 2 moles of 
So, 8.70 moles of
are produced from
moles of
or 2.175 moles of 
Molar mass of
= 58.12 g/mol
So, mass of
required =
= 126.4 g
Hence 126.4 g of
are required