![]() The intensity is indicated by the number of dots per square inch. The four images below represent the intensity of light at various distances from a flash bulb. Once they have done this you may wish to show them the equation (in this case, k = 4531.25) and have them plug in the four given data points to test the equation.įor more advanced students, you may wish to give them the general form of the equation, above, and have them determine the value of k and find the specific equation, or have the students themselves use trial and error to determine the general form of the equation (by testing equations such as I = -kd + c, I = k/d, I = k/d².Īnswers: 10 feet corresponds to 45.3 dots per square inch 3 feet would correspond to 503.5 dots per square inch. The amplitude of the light is then proportional to. This means that as the distance from a light source increases, the intensity of light is equal to a value multiplied by 1/d2. The next step would be to identify which is the independent variable (distance), and the dependent variable (intensity), and graph the four given data points in a cartesian coordinate system (11.2, 36.25), (7.9,72.5), (5.6,145), (5,181.25).īeginning algebra students would sketch a curve in the graph to estimate the answers to the questions. According to Plancks equation, the energy of a photon is proportional to the frequency of the light. The relationship between intensity of light (I), and distance from the source of the light (d), is given by the equationĪs the first step of their investigation, students should identify the two variables involved (intensity, measured in dots per square inch, and distance from the source of the light, measured in feet). Procedure: This activity is best done by students working individually or in teams of two. The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material.Electrons emitted in this manner are called photoelectrons. Add the three light terms together and divide them by. The emission of electrons from a metal plate caused by light quanta photons. Can extrapolate a graph when a pattern exists Download the Teacher Guide PDF Calculate the distance from the pixel to the light origin and use it to reach the total attenuation value. ![]()
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