Answer:
The current amount of the Potassium-40 sample is approximately 37.521 grams.
Explanation:
The amount of the sample of the radioactive isotope decays exponentially in time, the amount of mass of the sample as a function of time (
), in grams, is described below:
(1)
Where:
- Initial mass, in grams.
- Time, in years.
- Time constant, in years.
The time constant can be found from half life (
), in years, described in statement:
(2)
If we know that 
, 
and 
, then the current amount of the sample is:
The current amount of the Potassium-40 sample is approximately 37.521 grams.
Answer:
the solstice make day or night significance longer .The mast important thing that they do idps cause the seasons ,with the earth on its 23.5 degrees angle along with the sun and the rotation the earth this causes the seasons and the appropriate climate for human to live
Answer:
A. South Africa
Explanation:
from 1948 and into the early 1990s
Answer:
Heliophobia refers to intense, sometimes irrational fear of the sun. Some people with this condition are also afraid of bright, indoor light. The word heliophobia has its root in the Greek word helios, which means sun.
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