What is the half-life of a radioisotope? a. half of the time needed for a sample of radioisotope to become stable
b. the time needed for half of a sample of radioisotope to decay
c. the time needed before the first half of a radioisotope begins to decay
d. half of the time needed for a radioisotope to leave the body

the largest known star in the universe is uy scuti, a hypergiant with a radius around 1,700 times larger than the

when it gains or loses electrons

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2