![]() ![]() The kinetic energy can be measured indirectly by using what is known as the stopping voltage. Mathematically, this can be expressed as: KEY TOPIC/CONCEPT E photon = E kinetic + E escape - Photon energy, work function, work done in electrostatic field. Photoelectric Effect needed to escape the metal's surface, and the kinetic energy due to its movement after it escaped. The other electron is buried several layers below. One electron is found right on the surface of the metal. Imagine 2 electrons on a plate of sodium metal. In the experimental set up for Photoelectric effect, the photo-current becomes zero when the applied voltage reaches the □ Stopping potential □ Saturation potential □ Zero voltage □ Infinitely high voltage 7. Which of the following is true in the case of Photoelectric effect? □ It is not an instantaneous phenomenon □ The greater the intensity of incident light, the greater is the photo current □ The kinetic energy of photo electrons increases with the frequency of incident radiation □ The photo current not dependent on the frequency of incident e. What is the fundamental theory which was able to explain Photoelectric effect? □ Classical theory □ Quantum Theory □ Wave theory □ Corpuscular theory d. ![]() Who was the first person to give the correct explanation of the phenomenon? □ Isaac Newton Max Planck □ Einstein □ Heinrich Hertz c. The phenomenon 'Photoelectric effect' was first observed by Heinrich Hertz. The phenomenon is called? □ Thermal emission □ Compton effect □ Photovoltaic effect Photoelectric effect b. When UV light is incident on a Zinc metal surface, some electrons are emitted. In the following, indicate the correct answer with a tick: a. What is meant by 'Work Function'? 'Stopping Potential'? 6. ![]() Write down the important formula for 'Photoelectric effect' and describe all terms used 4. Draw a diagram to illustrate the phenomenon of 'Photoelectric effect' in the space below 3. What is meant by 'Photoelectric effect'? Mention 3 applications of 'Photoelectric effect' 2. Comment on the relationship between the intensity of the light and stopping voltage. For instance, a change from 100 to 90 may not be significant.) 7. (Make significant changes in the intensity. Repeat at 3 other intensities with the same wavelength. ![]() Record the stopping voltage at each intensity 6. Find the lowest negative voltage necessary to get a current 5. Pick a wavelength in the violet/blue region. Make sure that "show photons" is selected (Options). You should reset calculator for new calculation however result of last field can be recalculated without reset the calculator, you just need to change the value of other fields.Part C: The intensity of the photons 1.Please use the mathematical deterministic number in field to perform the calculation for example if you entered x greater than 1 in the equation \ to calculate r (which cannot be expressed explicitly in terms of a,n) enter some arbitrary value of r in the first iteration along with the values of a and n and in the next iteration adjust the value of a and n to get correct value of r.Enter the scientific value in exponent format, for example if you have value as 0.0000012 you can enter this as 1.2e-6. ![]()
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