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A 100 g sample of a radioactive isotope has a half life of 2 days. After 6 days how many grams of the original radioactive isotope are left?


The pitch was clocked at 100.9 mi/hr (45.0 m/s). Determine the impulse required to give a 0.145-kg baseball such a momentum.


The mass of a typical car is m=1000kg. so its weight on the Earth’s surface is mg=9800N. Suppose you have two containers, one with N electrons and another with N protons. These two containers are placed a distance 10m apart, and the electric force between them is equal to the weight of the car. Find N.


 The mass of a typical car is m=1000kg. so its weight on the Earth’s surface is mg=9800N. Suppose you have two containers, one with N electrons and another with N protons. These two containers are placed a distance 10m apart, and the electric force between them is equal to the weight of the car. Find N.1.      



What do you think would happen to the universe that we know today if the charge of the electron becomes positive and the charge of the proton inside the nucleus becomes negative?


Tritium is an isotope of hydrogen that decays by emitting beta particles. It is used in

some luminous signs. The symbol for tritium is (3 1 H)


a. Determine the binding energy in units of MeV. Given the atomic mass of

tritium is 3.0160492 u


b. Describe three differences between an alpha particle and a beta particle.



How old is the bone if if it is presently contains 0.3125 g od C-14, but it was estimated to have originally contained 80.000 g of C-14. the half life of Carbon-14 is 5730 years.


n = ?

T = ? years


Selenium-83 has a half life of 25. 0 minutes. How many minutes would it take for a 10.0 mg sample to decay and have only 1.25 mg. remain?


n = ?

T = ? minutes


Supply what is missing on the following nuclear decay:



  • ALPHA DECAY     
  • BETA MINUS DECAY
  • BETA PLUS DECAY  
  • GAMMA DECAY

1. 227 Ac 89 --------> ____ + 223 Fr 87 + energy

2. type of decay in number 1: ____

3. 289 Fl 114  --------> 0e+1 + ____ + energy

4. type of decay for number 3: ____

5. ____  --------> 4He 2 +281 Ds 110 + energy

6. type of decay in number 5: ____

7. 259 No 102 --------> 0Y0 + ____

8. type of decay in number 7: ____

9. 243 Am 95 --------> ____ + 243 Am 95 

10. type of decay in number 9: ____

A radioisotope has an initial activity of 5 millicurie. 48hours later, the observed activity is 4 millicurie. Determine: a) The half life of the radioisotope

b) The initial number of nuclides in the radioisotope.

Nb,Show workings



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