Physics Revision Notes for Class 12 for Chapter 11 Dual Nature of Radiation and Matter

The dual (wave-particle) nature of light is discussed clearly in this and preceding chapters. The wave nature of light is seen in phenomena such as diffraction, interference and polarisation. On the other hand, in phenomena such as Compton effect and the photoelectric effect that involve energy-momentum transfer, radiation behaves as a particle known as the photon. Study about Einstein’s photoelectric equation and De-Broglie’s Hypothesis in this chapter. Find here the CBSE class 12 physics revision notes for chapter 11 dual nature of radiation and matter that helps in the revision of this chapter.

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A lead ball at 30C is dropped from a height of 6.2 km. The ball is heated due to the air resistance and it completely melts just before reaching the ground. The molten substance falls slowly on the ground. Calculate the latent heat of fusion of lead. Specific heat of lead = 126J/kgC and melting point of lead = 330C. Assume that any mechanical energy lost is used to heat the ball. Use $$g = 10 m/s^{2}$$.