NEET Exam > NEET Videos > Chemistry Class 11 > Photoelectric Effect
Photoelectric Effect Video Lecture | Chemistry Class 11 - NEET
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FAQs on Photoelectric Effect Video Lecture - Chemistry Class 11 - NEET
| 1. What is the photoelectric effect? |  |
Ans.The photoelectric effect is the phenomenon where electrons are emitted from a material, usually a metal, when it is exposed to light or electromagnetic radiation of sufficient energy. This effect demonstrates the particle nature of light and supports the concept of photons, which are packets of energy.
| 2. How does the frequency of light affect the photoelectric effect? | |
Ans.The frequency of light plays a crucial role in the photoelectric effect. Only light with a frequency above a certain threshold can cause the emission of electrons. If the frequency is below this threshold, no electrons will be emitted, regardless of the light's intensity. This relationship is described by the equation E = hf, where E is the energy of the photon, h is Planck's constant, and f is the frequency.
| 3. What is the work function in the context of the photoelectric effect? | |
Ans.The work function is the minimum energy required to remove an electron from the surface of a material. It is a characteristic property of the material and is denoted by the symbol φ (phi). If the energy of the incident photons is greater than the work function, electrons can be emitted; if not, no photoelectrons will be released.
| 4. How does the intensity of light influence the photoelectric effect? | |
Ans.The intensity of light influences the number of electrons emitted during the photoelectric effect but not their energy. Higher intensity means more photons are hitting the surface of the material, which can lead to the emission of more electrons, provided that the light's frequency exceeds the threshold frequency. However, increasing intensity without increasing frequency will not increase the energy of the emitted electrons.
| 5. What are some practical applications of the photoelectric effect? | |
Ans.The photoelectric effect has several practical applications, including in photoelectric sensors, solar panels, and photomultiplier tubes. These technologies rely on the conversion of light energy into electrical energy, enabling devices such as cameras, light meters, and various electronic systems to function effectively.
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Dec 18, 2024 Last updated |
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