Summary of HC Verma Solutions Part 2 Chapter 42: Photoelectric Effect And Wave-Particle Duality
This chapter talks about the Photon Theory of Light, the photoelectric effect, as well as Einstein's Photoelectric equation. It also includes a detailed experiment with proper diagrams for the same. Lastly, this chapter draws a comparison between the Photoelectric Effect and Wave Theory of Light.
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FAQs on HC Verma Solutions Class 12 Chapter 42 - Photoelectric Effect and Wave-Particle Duality
1. What significance does the Photoelectric effect have?
The Photoelectric effect’s significance stems from showing how light rejects the traditional Wave model, and how light is perceived as photons of energy. According to the Wave model, if the amplitude gets high then the intensity of the light Wave should increase and eject more electrons.
However, this hypothesis was proven wrong. It wasn’t amplitude that significantly increased the number of electrons ejected, but rather the number of photons ( the # of photons is proportional to the intensity of light ). The effect describes how photons truly interact with electrons on a metal surface.
2. What is the importance of Wave-Particle Duality?
The probability of a Particle being in any location is a Wave, but the actual physical appearance of that Particle is not a Wave. While mathematics, even though complicated, make accurate assumptions, the physical meaning of these questions is much harder to understand. The attempt to explain the Wave-Particle Duality is a key point of debate in Quantum Physics.
3. Why is the knowledge on Wave-Particle Duality important to understand the Photoelectric effect?
The energy of the emitted electrons depends only on the frequency of the incident light, and not on the light intensity. The study of the Photoelectric effect led to essential steps in understanding the quantum nature of light and electrons, which would eventually lead to the concept of Wave-Particle Duality.
4. What are the main features of the Photoelectric effect?
The Photoelectric effect has three important characteristics that cannot be explained by classical Physics: (1) the absence of lag time, (2) the independence of the kinetic energy of photoelectrons on the intensity of incident radiation, and (3) the presence of a cut-off frequency.
5. How did Max Planck discover the theory of Quantum Physics?
Planck’s work in Thermodynamics led to the articulation of his Quantum theory. Planck called the packets of energy quanta and he was successful in determining that the energy of each quanta is equal to the frequency of the radiation multiplied by a universal constant that he derived.