For 10 points, name this physicist who names the length scale of a plasma.
In an alternating electric field, this man names the equation that gives permittivity as the high frequency limit permittivity plus the difference between the low and high limit all over one plus i times frequency times relaxation time. He described the attenuation of scattering due to thermal motion as the exponential of minus a term proportional to the average of the squared scattering vector with Waller. He developed a model with a temperature-cubed dependence that incorporated phonon energy contributions, thereby improving on Einstein's, for predicting the specific heat of solids. For 10 points, name this physicist who names the length scale of a plasma.
In an alternating electric field, this man names the equation that gives permittivity as the high frequency limit permittivity plus the difference between the low and high limit all over one plus i times frequency times relaxation time.
Peter Joseph William {Debye}