Asealed box was found which stated to have contained an alloy composed of equal parts by weight of two metals a and b. these met als are radioactive, with half lives of 12 years and 18 years, respectively and when the container was opened it was found to contain 0.53 kg of a and 2.20 kg of b. deduce the age of the alloy.

The age of the alloy is 73.94 years.

Explanation:

For metal A:

Initial amount of metal A = x

Final amount after time t = 0.53 kg

Half life of metal A =

..(1)

For metal B:

Initial amount of metal B = x

Final amount after time t = 2.20 kg

Half life of metal B =

..(2)

Dividing (1) by (2)

t = 73.94 years

kinetic

i'm so sorry if this is wrong i'm only in 6th grade xd

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.