<span>The
surface of a mirror is smoothly and therefore the rays of light are
reflected with the same angle they hit the surface. The surface of a
piece of wood on the other hand has a lot of microscopical
imperfections and hence the rays of light are reflected in multiple
directions.</span>
Please provide whatever follows your question. Without it we cannot answer the question.
Emest Rutherford proved that the plum pudding model was incorrect then he experimented by firing cathode rays at gold foil.
An original sample of K-40 has a mass of 25.00 grams.
After 3.9 m 109 years, 3.125 grams of the original sample remains unchanged.
What is the half-life of K-40?
First step is to determine the remaining decimal amount.
3.125 grams /25.00 grams = 0.125
Second step is to determine the number of half lives.
(1/2)^n = 0.125
N log (1/2) = log 0.125
N = 3 years
Polyatomic ion: a covalently bonded group of atoms that has a positive or negative charge and acts as a unit.
