What is the impact parameter of an `alpha`-particle of initial energy 5 MeV scattered by `60^@` for Z=79 ?

Explanation

To find the impact parameter of an alpha particle with an initial energy of 5 MeV scattered at an angle of 60 degrees by a nucleus with Z = 79, we can follow these steps:

### Step 1: Understand the parameters involved
- The alpha particle has a charge of +2e (since it consists of 2 protons).
- The nucleus has a charge of +Ze, where Z = 79.
- The initial energy of the alpha particle is given as 5 MeV.

### Step 2: Convert energy from MeV to Joules
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