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Photoelectric Effect Questions And Answers 2024/2025 Update
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Photoelectric Effect Questions And Answers2024/2025 Update
What is the most direct evidence that light comes in quanta? Answer: The photo-electric effect
What is the photoelectric effect? Answer: The photoelectric effect is the emission of electrons from
a metallic surface when the electromagnetic radiation of a high enough frequency is incident on it.
What is a photon? Answer: The smallest unit of light or other electromagnetic energy, having no
mass and no electric charge. Photons behave both as particles and waves.
What is the formula to find the energy in a photon? Answer: E = hf
In the formula E = hf, what does the f stand for? Answer: f is the frequency of the radiation (Hz)
In the formula E = hf, what does the h stand for? Answer: h is the Planck constant
What is the size of the Planck constant? Answer: h = 6.63 x 10 -34 Js
How much of the photon energy is given to the electron? Answer: All of it!
What is the minimum amount of energy that is required by the electron to remove it from the metal?
Answer: The minimum amount of energy is called the work function (ϕ)
What happens if a photon contains less energy than the work function? Answer: No electrons are
emitted.
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