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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?
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
A point particle of charge 2.5 nC and mass 3.25x10^-3 kg is in a uniform electric field directed to the right. It is released from rest and moves to the right. After it has traveled 12.0 cm, its speed is 25 m/s. Find the (a) work done on the particle, (b) change in the electric potential energy of the particle, and (c) magnitude of the electric field.
How would you relate alchemy to synthesis off new elements?
Why the atomic number is called the fingerprint of elements
How many years has passed if only 3.125% of the original amount of U-238 remains?
If 1/f=1/u +1/v
Were u =10.5+-0.1cm and V =85+-0.1cm find minimum error in f
