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Concept of Stopping Potential Video Lecture | Crash Course for IIT JAM Physics
FAQs on Concept of Stopping Potential Video Lecture - Crash Course for IIT JAM Physics
| 1. What is stopping potential in the context of photoelectric effect? |  |
Ans.Stopping potential is the minimum potential difference needed to stop the most energetic photoelectrons emitted from a material when it is illuminated by light. It is a key concept in understanding the photoelectric effect, where light energy is converted into electrical energy, allowing researchers to measure the energy of ejected electrons.
| 2. How is stopping potential related to the energy of emitted electrons? | |
Ans.Stopping potential is directly related to the kinetic energy of the emitted electrons. According to the photoelectric equation, the stopping potential \( V_s \) can be expressed as \( eV_s = KE_{max} \), where \( KE_{max} \) is the maximum kinetic energy of the emitted electrons. Thus, a higher stopping potential indicates that the emitted electrons have greater kinetic energy.
| 3. What factors influence the value of stopping potential? | |
Ans.The value of stopping potential is influenced by several factors, including the frequency of the incident light and the work function of the material. According to the photoelectric effect, increasing the frequency of light increases the energy of the photons, which can lead to higher stopping potentials, while the work function determines the minimum energy required to eject electrons from the material.
| 4. How can stopping potential be experimentally determined? | |
Ans.Stopping potential can be experimentally determined by setting up a photoelectric experiment where light of known frequency is directed at a metal surface. By varying the potential difference applied in the opposite direction to the emitted electrons until the current stops, the stopping potential can be measured. This value can then be used to calculate the maximum kinetic energy of the emitted electrons.
| 5. Why is stopping potential important in modern physics? | |
Ans.Stopping potential is important in modern physics as it provides insights into the quantum nature of light and matter interaction. It plays a crucial role in experiments related to the photoelectric effect, helping to validate quantum theories and contributing to the development of technologies like photovoltaic cells and photodetectors, which are essential in solar energy applications and image sensors.
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