Atomic and Nuclear Physics Answers

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

1. An observer stands 600 meters from the launch pad of a rocket, watches it       ascend vertically at 100 m/s.

a.  Find the rate of change of the distance between the rocket and the observer. (Hint: Use Pythagorean Theorem)

 b.    Find the distance between the observer and the rocket when the rocket is 400 meters high.

 c.   What is the rate of change of the distance between the rocket and the observer when the rocket is 400 meters high?

One example of a nuclear fission reaction involving slowly moving neutrons is

1/0n + 235/92 U ---> 236/92 U* ---> 95/42 Mo + 139/57 La + (2) 1/0n

What is the total kinetic energy (in eV) of the products of the reaction? The relevant masses are:

235/92 U = 235.043 924 u; 95/42 Mo - 94.9058 u; 139/59 La = 138.9061 u, and 1/0n = 1.0087u

spectroscopic term symbol for He