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level: Photoelectric effect

Questions and Answers List

level questions: Photoelectric effect

QuestionAnswer
What is photoelectricityEmmision of elcetrons upon a metal by the exposure to light waves
Why do emitted electrons have a range of kinetic energies up to a maximum value?Photons have energy dependent on frequency One-to-one interaction between photon and electron Max KE = photon energy – work function More energy required to remove deeper electrons RIGHT: Energy given to the electron is fixed and a certain energy is required to overcome the work function of the metal. One to one interaction between photons and electrons. So the maximum kinetic energy is the energy of the photon minus the work function. As deeper electrons require energy to get to the surface, they have less energy than the surface electrons
What causes photoelectricityLight with a high enough frequency
Define the threshold frequencyThe minimum frequency of incident light which can cause PHOTOelectric emission
State what the work function of a metal isMinimum energy required to remove electron from metal
Describe how the process of representing the photoelectric effect can be seen with an electroscope?Place a negative charge on the electroscope Shine the short wave UV light on top This will discharge it Causes the gold leaf to go down
What is an electroscope?Scientific instrument used to detect the presence of electric charge
What were the conslusions drawn on the threhold freuency providing evidence against the light wave theory?Light above a certain frequency, no matter how weak the source, could release photoelectrons instantly, whereas light of a lower frequency no matter how intense or how long the source was applied for had no effect
What is quantum?Discrete quantity of energy
What is a photon of light?A photon is a desrcete packet of energy
What is the photoelectric equation?Max kinetic energy of a photon = 0.5 X mv^2 = planks constant X frequency - work function
What is a stopping potential?The perfect pd to counteract the current caused by the photoelectric effect
What observations of the photoelectric effect could not be explained by the wave theory?E = hf Frequency is linear with energy Intensity is indpeendent on energy No electrons produced below a frequency value
Which theory of light does NOT explain the photoelectric effect?Wave
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