Class 12 Physics Dual Nature of Radiation and Matter Notes | Photoelectric Effect for JEE & NEET
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Here are Dual Nature of Radiation and Matter Notes to prepare for Boards, JEE and NEET Exams. This Chapter discusses about everything that has Dual Nature. Like any matter can be wave as well as Particle. This chapter includes everything from Electron Emission and Photoelectric effect to particle nature of Light. From Explanations on the wave Nature of Matter to Davisson and Germer Experiments.
India's Best Exam Preparation for Class 12th - Download Now
India's Best Exam Preparation for Class 12th - Download Now
India's Best Exam Preparation for Class 12th - Download Now
India's Best Exam Preparation for Class 12th - Download Now
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Frequently Asked Questions
Find answers to common questions.
What is work function and which metal has the lowest work function?
Work function is the minimum energy (in eV) needed to eject an electron from a metal surface. Caesium has the lowest work function at approximately 2.0 eV, making it the most sensitive metal to light. Metals with low work functions are used in photoelectric devices like photocells and solar panels.
What is Einstein's photoelectric equation?
Einstein's photoelectric equation is KE_max = hν − φ, where KE_max is the maximum kinetic energy of the emitted electron, h is Planck's constant, ν is the frequency of incident light, and φ is the work function of the metal. It tells you exactly how much energy an electron gains after overcoming the metal's binding energy.
What is the photoelectric effect in simple words?
The photoelectric effect is the release of electrons from a metal surface when light hits it. Only light above a specific minimum frequency — called the threshold frequency — can eject electrons. The number of electrons ejected increases with light intensity, but their maximum kinetic energy depends only on the frequency of light. Einstein explained this using photons in 1905.
How many marks does this chapter carry in JEE Main and NEET?
In JEE Main, Dual Nature of Radiation and Matter typically contributes 1–2 questions (4–8 marks) per paper. In NEET, it contributes 2–3 questions (8–12 marks). High-yield topics are Einstein's photoelectric equation, stopping potential graphs, and de Broglie wavelength calculations. Consistent practice with previous year papers significantly improves accuracy in this chapter.
What is de Broglie wavelength and how is it calculated?
de Broglie wavelength (λ) is the wavelength associated with any moving particle, given by λ = h/mv, where h is Planck's constant, m is mass, and v is velocity. For an electron accelerated through potential V, the formula becomes λ = h/√(2meV). This concept proved particles have wave properties.
What is stopping potential in the photoelectric effect?
Stopping potential (V₀) is the minimum reverse voltage applied to a photoelectric cell that reduces photocurrent to zero. It equals KE_max/e, where e is the electron charge. Stopping potential depends on the frequency of incident light and the metal used — it does not change with light intensity.