Related Experiment Video
Updated: Jun 10, 2026

An Efficient and Flexible Cell Aggregation Method for 3D Spheroid Production
Published on: March 27, 2017
Approximation to extinction efficiency for randomly oriented spheroids
Abstract:
A semiempirical approximation to the extinction efficiency Q(ext) for randomly oriented spheroids, based on an extension of the anomalous diffraction formula, is given and compared to the extended boundary condition method or T-matrix method. Using this formula, Q(ext) can be evaluated over 10(4) times faster than by previous methods. This approximation has been verified for complex refractive indices m = n - ik, where 1.01 = n >/= 2.00 and 0 = k >/= 1 and aspect ratios from 0.5 to 4. We believe the approximation is uniformly valid over all size parameters and aspect ratios. It has the correct Rayleigh and large particle asymptotic behavior. The accuracy and limitations to this formula are extensively discussed.
Related Concept Videos
Estimation of the Physical Quantities
Gauss's Law: Spherical Symmetry
Ostwald’s Dilution Law
Gravitation Between Spherically Symmetric Masses
Schwarzschild Radius and Event Horizon
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...
Maxwell-Boltzmann Distribution: Problem Solving
This distribution function f(v) is defined by saying that the expected number N (v1,v2) of particles with speeds between v1 and v2 is given by

