Problem: In an experiment to study the photoelectric effect, a scientist measures the kinetic energy of ejected electrons as a function of the frequency of radiation hitting a metal surface. She obtains the following plot.The point labeled "v0" corresponds to light with a wavelength of 536 nm. What is the value of v0 in s–1?

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In an experiment to study the photoelectric effect, a scientist measures the kinetic energy of ejected electrons as a function of the frequency of radiation hitting a metal surface. She obtains the following plot.
A graph has frequency on the X-axis and electron kinetic energy on the Y-axis (both increasing, unscaled).  A horizontal line is at 0 on the Y-axis until frequency nu subscript naught at which point it begins increasing linearly.

The point labeled "v0" corresponds to light with a wavelength of 536 nm. What is the value of v0 in s–1?