17 - Modern Physics - Physics 8B 17 Modern Physics rev 4.0...

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Unformatted text preview: Physics 8B 17 Modern Physics rev 4.0 17 Modern Physics 1. Q: Accepting the dual nature of electromagnetic radiation, which one or more of the following statements would you agree with? Explain your reasoning. a) Only high-energy photons land at a maximum of an interference pattern on a screen. b) In a two-slit interference pattern maxima, as predicted by the wave model, are regions where there is a high probability of a photon landing. c) It can be predicted where a particular photon will land in an interference pattern. d) The particle rather than the wave model predicts the location of regions of minimum disturbance in a diffraction pattern. e) If only a few photons are present, wave properties are difficult to demonstrate. Physics 8B 17 Modern Physics rev 4.0 2. A single electron in a TV tube typically carries the energy of 4.0 10-15 J. To break one DNA strand requires energy in the order of 10-19 J. a) P: How many DNA molecules does such an electron damage? b) Q: Does this explain the need for shielding? c) Q: The energy of an electron depends on its speed. All photons in air have the same speed. How is it possible then, that the energies of photons of different colors of visible light are different? 3. Visible light ranges in wavelength from about 400nm for violet light to about 700nm for red light. a) P: Estimate the order of magnitude of the energy of a photon coming from a 100W household light bulb. b) P: Estimate the order of magnitude of the number of photons leaving the filament of the bulb in 1s. c) P: By considering photon momentum, estimate the order of magnitude of the power of a light source in your bedroom so strong that, when you turn the light on, you are almost knocked over. Physics 8B 17 Modern Physics rev 4.0 4. For green light at the absorption maximum of rhodospin of wavelength 510nm, the absolute energy threshold of the dark-adapted human eye is 4.0 10-17 J. That is, the J....
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This note was uploaded on 09/28/2009 for the course PHYSICS 8B taught by Professor Shapiro during the Spring '07 term at University of California, Berkeley.

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17 - Modern Physics - Physics 8B 17 Modern Physics rev 4.0...

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