Answer:
12.3 years
Explanation:
The equation of the radioactive decay can be written as follows:
(1)
where
N(t) is the amount of radioactive sample left at time t
N0 is the amount of radioactive sample at time t=0
t is the time passed
is the half-life of the isotope
The problem tells us that after t=36.9 y, the amount of sample which has become stable is 7/8. This means that 7/8 of the sample has already decayed, so the amount of radioactive sample left is
We can now re-arrange equation (1) by using this information and by substituting t=36.9 y we find:
So, the answer is
12.3 years
A is acceleration. T is tension. This is the general formula for an Atwood machine. You should make sure you can do it on your own
Answer:
the floor is clean and the soap is dirty. lol
Answer:
option A
Explanation:
given,
light is incident on the plane surface at (i) = 55°
angle of refraction (r) = 37°
μ is the refractive index of the material
using Snell's law
The refractive index of the material is
hence, the correct answer is option A