List of top Pharmaceutical Engineering Questions on Size reduction and size separation

The given equation represents which law: \[ E = K_k \ln \frac{d_1}{d_2} \]
Which of the following mills is based on the mechanism of impact and attrition for size reduction:
This given equation represents which law: \(E=K_k\ ln \frac {d_1}{d_2}\)
Which of the following mills is based on the mechanism of impact and attrition for size reduction: