Question

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

• A. 56
• B. 112
• C. 60
• D. 120

Answer 1

Answer: (B)

112

Answer 2

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