Gthe radioactive isotope americium-241 is used in smoke detectors. it has a rate constant for radioactive decay of 1.6 × 10-3 yr-1 . by contrast, iodine-125, which is used to test for thyroid functioning, has a rate constant for radioactive decay of 1.1 × 10-2 day-1 . (i) what are the half-lives of these two isotopes ? (ii) which one decays at a faster rate ? (iii) how much of a 1.00 mg sample of each isotope remains after three half-lives ?

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explanation:

wind is defined by the direction it blows from.   for example, a wind blowing from north to south is called a northerly wind.

speed

ratio of distance traveled to time interval

net force

vector sum of forces on object

object

source of diverging light rays either luminous or illuminated

don't remove my answer im trying my best to answer them

explanation:

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