In an `alpha`-particle scattering experiment, the number of particles scattered at an angle of `90^@` is 100 per minute. Calculate the number of particles scattered at an angle of `60^@`

Explanation

To solve the problem of calculating the number of particles scattered at an angle of 60 degrees based on the given information about scattering at 90 degrees, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the relationship**: In alpha particle scattering experiments, the number of particles scattered at an angle θ is proportional to \( \frac{1}{\sin^4(\frac{\theta}{2})} \).

2. **Identify given values**: We know that:
- Number of particles scattered at 90 degrees, \( N_1 = 100 \) particles/minute.
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