<span>It is the Sun lighting different parts of the Moon at different times and varying amounts of the Moon's lit surface being visible from Earth.</span>
Set this up as
10 = 40 (1/2)t/28
and solve for t in years.
10/40 = (1/2)t/28
log(0.25) = (t/28) log(0.5)
t = 28 log(0.25) / log(0.5) years = 56 years
Test the answer:
56 years = 2(28 years) = 2 half-lives, so the remaining amount should be 1/2 of 1/2 of the initial amount, i.e. 1/4 of the initial amount, and 10 mg = 1/4 of 40 mg.
Answer:
a. red-brown
Explanation:
Specular Hematite is a mineral which is found in rocks and soils. The crystal of specular hematite is greyish black in color but it can form the streak of reddish color which is due to the presence of iron oxide. It has metallic luster which gives a look like silver and has shiny flakes.
Answer:
be suitable for the elderly
Explanation:
