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Photoelectric Effect & Dual Nature of Matter Radiations PPT Physics Class 12

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FAQs on Photoelectric Effect & Dual Nature of Matter Radiations PPT Physics Class 12

1. What is the photoelectric effect?
Ans. The photoelectric effect refers to the phenomenon where electrons are ejected from a material's surface when it is exposed to light or electromagnetic radiation of a certain frequency. This effect supports the particle nature of light, as it suggests that light is composed of discrete packets of energy called photons.
2. How does the photoelectric effect support the dual nature of matter radiations?
Ans. The photoelectric effect provides evidence for the dual nature of matter radiations by demonstrating that electromagnetic radiation, such as light, can exhibit both wave-like and particle-like properties. In this phenomenon, light behaves as particles (photons) when it interacts with matter, causing the ejection of electrons. This supports the concept of matter radiations having both wave and particle characteristics.
3. What is the significance of the threshold frequency in the photoelectric effect?
Ans. The threshold frequency in the photoelectric effect is the minimum frequency of light required to cause the ejection of electrons from a material's surface. Below this frequency, no electrons are emitted regardless of the intensity of the light. The threshold frequency is significant as it determines whether or not the photoelectric effect will occur and provides information about the energy required to release electrons from the material.
4. How does the intensity of light affect the photoelectric effect?
Ans. The intensity of light affects the photoelectric effect by determining the number of electrons ejected from a material's surface, but it does not impact the kinetic energy of the emitted electrons. Increasing the intensity of light increases the number of photons incident on the material, resulting in a higher number of ejected electrons. However, the kinetic energy of the emitted electrons remains dependent on the frequency of the light, not its intensity.
5. What are some practical applications of the photoelectric effect?
Ans. The photoelectric effect has several practical applications. One significant application is in photovoltaic cells or solar panels, where it is used to convert light energy into electrical energy. The photoelectric effect is also utilized in photocells, which are used in automatic doors, burglar alarms, and light sensors. Additionally, the photoelectric effect plays a crucial role in digital imaging technologies such as digital cameras and scanners.
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