Four measurements of wavelength shift are listed below

PHYSICS · Subjective · AP · Physics 2: Algebra-based · Modern Physics · Modern Physics

Problem

Four measurements of wavelength shift are listed below.

\theta

(deg): 0 60 90 135

\Delta\lambda

(pm): 0.00 1.20 2.40 3.80 Using only the first three data points to define a straight-line relationship, predict the wavelength shift expected at

\theta = 135^\circ

and calculate the percentage deviation of the actual

3.80\,\text{pm}

measurement from this prediction.