1120_Physics ProblemsTechnical Physics

1120_Physics ProblemsTechnical Physics - 40 Introduction to...

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40 CHAPTER OUTLINE 40.1 Blackbody Radiation and Planck’s Hypothesis 40.2 The Photoelectric Effect 40.3 The Compton Effect 40.4 Photons and Electromagnetic Waves 40.5 The Wave Properties of Particles 40.6 The Quantum Particle 40.7 The Double-Slit Experiment Revisited 40.8 The Uncertainty Principle Introduction to Quantum Physics ANSWERS TO QUESTIONS Q40.1 Planck made two new assumptions: (1) molecular energy is quantized and (2) molecules emit or absorb energy in discrete irreducible packets. These assumptions contradict the classical idea of energy as continuously divisible. They also imply that an atom must have a definite structure—it cannot just be a soup of electrons orbiting the nucleus. Q40.2 The first flaw is that the Rayleigh–Jeans law predicts that the intensity of short wavelength radiation emitted by a blackbody approaches infinity as the wavelength decreases. This is known as the ultraviolet catastrophe . The second flaw is the prediction much more power output from a black-body than is shown experimentally. The intensity of radiation from the blackbody
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