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Question-1. What Does Planck's constant represent?
Answer-1: Planck's Constant represents the Photon Potential Energy. Planck's Energy, E= is the key to Planck's constant.
Question-2. What is Photo-electric effect?
Answer-2: Photo electric effect is a process where electron are ejected from a surface by the action of light (Electromagnetic Radiation)
Question-3. What is the unit of Planck's constant?
Answer-3: The unit is Joule-second.
Question-4. What is the relation between energy of photon and its wavelength?
Answer-4: A photon is characterized by either a wavelength, denoted by λ or equivalently an energy, denoted by E. There is an inverse relationship between the energy of a photon (E) and the wavelength of the light (λ) given by the equation:
E = hc/λ
Question-5. If the frequency of light increases will the energy increase or decrease?
Answer-5: As the frequency of electromagnetic radiation increases, the energy of each photon increases. These quantities are directly proportional; within a constant (Planck's constant).
Question-6. What is the law of photoelectric emission?
Answer-6: Laws of Photoelectric Effect:
Question-7. How wavelengths of light affect the production of photo electron?
Answer-7: Light of shorter wavelength is more effective in producing photo- electrons than light of longer wavelength.
Question-8. What is Plank's constant?
Answer-8: It is the constant of proportionality relating the energy of a photon to the frequency of that photon. Its value is approximately 6.626 ? 10-34 joule-second. Its symbol is h.
Question-9. Describe the importance of Planck's constant.
Answer-9: Planck's constant is important for several reasons: it defines the quanta (minimum amount) for the energy of light and therefore also the energies of electrons in atoms. It also factors into something called the Uncertainty Principle.
Question-10. When photoelectrons are emitted from a metallic surface?
Answer-10: Photoelectrons are emitted from a metallic surface only when the incident light has more than a certain minimum frequency.
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