Answer:
The answer is below
Explanation:
The half life of a substance is the time required by that substance to reduce to half of its initial value. The half life is calculated using the formula:
Given that t = 87 years, half life = 29 years, therefore the quantity of strontium-90 left is:
That is one-eight of Strontium 90 would be left after 87 years
The lack of oxygen, poor/ bad bacteria smear, or difference in temperature that prevents optimal growth, within media.
Answer:
(2) 988.5 mb.
Explanation:
The air pressure descends as we ascend. In other words, they are inversely proportional.
The air pressure descends as we ascend the mountain because the air molecules that are above us in high altitudes are fewer than the number of air molecules that are above us in the base of the mountain. So, the exerted pressure of the molecules on ourselves is lower in high altitudes.
Due to the reason mentioned above, we can deduce that the only correct option is option number two since the other ones show increasing or the same pressure, which is not possible as we ascend.
Answer:
Ozone high in the atmosphere is a pollutant, but near Earth's surface, it provides protection from harmful rays.
Explanation:
I had this test last week so here you go, let me know if it helped!