61. Using the Heller calibration curve, calculate the particle size of the polystyrene latex from the optical density D vs.
wavelength λ. The Heller curve must first be plotted with the following data:

Latex particle diameter, d, nm 77.0 88.0 95.0 106.7 111.0 119.0 132.0 143.0 158.0 167.0 189.0
Exponent n in the Heller equation 3.82 .364 3.545 3.30 3.235 3.04 2.82 2.72 2.66 2.45 2.365 2.14
λ, per 400 440 490 540 582 630
D 0.562 0.414 0.289 0.207 0.159 0.120

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