Question

The length of the line that bisects the particle image is called as _______ diameter.

• A. \( \text{Feret} \)
• B. \( \text{Martin} \)
• C. \( \text{Projected area} \)
• D. \( \text{Coulter} \)

Hint:

Remember that Martin diameter involves a bisecting line, while Feret diameter involves parallel tangents.

Answer 1

The Correct Option is B

The Martin diameter is defined as the length of the line that bisects the image of the particle and is parallel to a fixed direction. The Feret diameter, on the other hand, is the distance between two parallel tangents to the particle image. Projected area diameter is the diameter of a circle having the same area as the projected area of the particle. Coulter diameter is based on the change in electrical resistance when a particle passes through a small aperture.