Answer:
A. 28 years
Explanation:
Applying,
R = R'(2ᵃ/ⁿ).............. Equation 1
Where R = Original sample, R' = Sample left after decay, a = Total time taken to decay, n = half life.
From the question,
Given: R = 12 g, R' = 6 g, a = 28 years.
Substitute into equation 1 and solve for n
12 = 6(2²⁸/ⁿ)
12/6 = 2²⁸/ⁿ
2²⁸/ⁿ = 2
Equation the base,
28/n = 1
n = 28 years.
Hence the half-life is 28 years
Answer:
the planet's gravity will cause Triton to fly into Neptune
Explanation:
Gravitational force is a force of attraction between two bodies with considerable masses.
One of the mass tends to pull the other to it's center.
As the force of gravity between two bodies grow, the more massive body will be drawn to the other one.
- The effect is that one body will eventually collide with the other.
- Since the planet pulls very hard on its moon
- On the long run, we can expect Triton to fly into Neptune in the foreseeable future.
The tiny holes in a sponges outer layer that take in water are called ostia, I believe. Hope it helps
