Answer:
The fraction of Sr-90 left after 73 years is 0.1726
Explanation:
Initial mass of the isotope =
Time taken by the sample, t =
Formula used :
where,
= initial mass of isotope
N = mass of the parent isotope left after the time, (t)
= half life of the isotope
= rate constant
We have:
t = (2018 - 1945 )years = 73 years
So, on substituting the values:
Now put all the given values in this formula, we get
The fraction of Sr-90 left after 73 years = 0.1726
Answer:
D
Explanation:
all of them are primary socialization groups
um I believe its heat transfer, or something called ligma.
Answer:
C.
Explanation:
The heat island effect or the the urban heat island effect, is where the temperature of an area is higher than close rural areas. This is because materials suh and concrete and asphalt absorb the sunlight and store it, causing extreme weather.