![]() Where the gradient is the Plank constant (h) and the y intercept is the work function( f), the intercept on the x-axis is the threshold frequency f 0.Mv^2 = 0\), is just the work function of the metal, \(\Phi = hν_0\). ![]() So plotting a graph of frequency (f) on the x-axis and maximum kinetic energy (E k) on the y-axis will give a straight line graph. We can use Plancks equation to calculate the energy of the photon, E photon : E photon h ( 6.626 × 10 34 J s ) ( 3.0 × 10 16 Hz ) plug in values for h and 2. The above equation can be rearranged into the from y=mx+c The light intensity corresponds to the number of photons arriving at the metal surface per unit time. So we can see from the equation above that if the light does not have a big enough frequency (f) so that the photon has enough energy to overcome the work function ( f) then no photoelectrons will be emitted. Here, h is Planck constant, c is the speed of light, and lambda is the wavelength of the photon. The energy of a photon of light = hf and the work function ( f)is the minimum energy required to remove an electron from the surface of the material. The photon energy can use this equation to calculate: Ehc/lambda. E k = the maximum kinetic energy of the emitted electrons in joules (J) The energy of each photon is E hf E h f, where h is Planck’s constant and f is the frequency of the EM radiation.f = the frequency of the incident light in hertz (Hz).The intensity is defined as power per unit area, and power is defined as energy per unit time. ![]()
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