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  4. In Rutherford experments on α - ray scattering the number of particles scattered at 90° be 28 per minute. Then the number of particles scattered per minute by the same foil but at 60° are

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Q. In Rutherford experments on $\alpha$ - ray scattering the number of particles scattered at $90^\circ$ be 28 per minute. Then the number of particles scattered per minute by the same foil but at 60$^\circ$ are

Atoms

Solution:

No. of particles scattered at angle $\theta$ is
$N \alpha \frac{1}{sin^4 \left( \frac{\theta}{2} \right)}$