The half-life of Th-232 is 1.405 × 10¹⁰ years
Time elapsed = 2.8 x 10⁹ years
Equation of radioactive decay:
A = A₀ = (1/2)^ t/t₁/₂
where A₀ is the initial amount, A is the amount after time t, t₁/₂ is the half file
The fraction of thorium-232 that remains in the rock after 2.8 billions years is,
A/A₀ = (1/2) ^ (2.8 x 10⁹/ 1.405 × 10¹⁰) = 0.871
Therefore, the percentage of thorium-232 in the rock that was dated at 2.8 billions year = 87.1%
Answer: Energy of a shear wave relates to the direction of a particle motion is downwards.
Explanation:
Answer:
0.3
Explanation:
if I'm wrong don't mark it against me
Answer:
2. A
3.B
4.B
Hope this helps,Pls mark as Brainliest!!
