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# Use the following photoelectric graph to answer the following question: Graph titled Photoelectric Effect for a Photomissive Metal is shown. The y axis is labeled kinetic energy and scales from negative 2 to positive 4 electron volts. The x axis is labeled frequency from 0 to 11 times 10 to the 14 hertz. A straight line connects the points 0, negative 1.2 and 5.5, 1 and 9, 2.5. If you use a different experimental photo-missive material, what would be the same on the graph? A The y-intercept B The intercept C The slope

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The photoelectric effect is obtained when shining a light on a material, resulting in the emission of electrons.The kinetic energy of the electrons depends on the frequency of the light:K = h(f - f₀)where:K = kinetic energy h = Planck constantf = light frequencyf₀ = threshold frequencyRearranging the formula in the form y = m·x + b, we get:K = hf - hf₀where:K = dependent variablef = independent variableh = slopehf₀ = and-interceptEvery material has its own threshold frequency, therefore, what remains constant for all materials is h = Planck's constant (see attached image).Therefore, the correct answer is (C) the slope.