13. I h ave a sample of 10,000 radio active atoms with a half life of 1 week. Ca

Question

13. I have a sample of 10,000 radio active atoms with a half life of 1 week. Calculate how many atoms have NOT decayed

a) 1 week later

b) 2 weeks later

c) 4 weeks later

14. Complete the following alpha decay equation. Include the mass number and

name of the nucleus that is produced: 210Po ? + + Energy

15. Small nuclei release energy in the process of nuclear .......

a) Fission

b)Fusion

c)Both

16. Large nuclei release energy in the process of nuclear .....

a) Fission

b) Fusion

c) Both

17. One of Einstein’s most important equations tells us that energy and matter are very closely related and interchangeable. Which equation am I referring too

and what does it tell me about the mass of the initial material and products in a nuclear fission or fusion reaction that releases energy ?

18. In an accident at a nuclear lab, a researcher inhales 1 million atoms of a radio active element and they are stuck in his lungs. The element is an alpha

emitter. Which would cause more concern and why?

a. The element has a half life of 5 billion years

b. The element has a half life of 1 week.

(Assume that the kinetic energy of the alpha particle emitted in a) and b) is the same

Explanation / Answer

13. after a week u will have 5000 atoms remaining

again after 2 weeks you will have 2500 atoms remaining

after three weeks you will have 1250 atoms remaining.

14.The reaction can be written 210Po ----------------> 206Pb + 4He. This polonium nucleus has 84 protons and 126 neutrons.

15. smaller nuclei undergo nuclear fusion ( like Hydrogen fuses to helium)

16.Large nuclei release energy in the process of nuclear

a) Fission ( due to unstable atoms the larger atoms break into stable and smaller atoms)

17.

we are talking about the equation E= mc2

it tells us that the mass defect is responsible for the release of energy in nuclear fusion or fission

18. The element ha s a half life of 1 week.will be dangerous as the material will degrade quickly emitting particles and radiation exposing the person to risks

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