Unit1_Chap12_SUM08Zumdhal-2

# Unit1_Chap12_SUM08Zumdhal-2 - In summary: Energy is...

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In summary: Energy is quantized and can be transferred only in discrete units called quanta. Light shows characteristics that suggest that it is has particle-like nature and is not purely wave-like! Does matter have a dual nature as well? The work of Plank and Einstein prompted Louis De Broglie, a French physicist, to ask: What about matter? While it is assumed to have particle like nature, could it also display any wave-like behavior? In 1925, a French scientist, Louis De Broglie , proposed that all particles have wave-like properties. So, any particle with mass m and velocity v should have a wavelength associated with it: λ particle = h/p = h/mv. Therefore, the larger the mass, the smaller the wavelength. A body of a large mass has such a small wavelength and does not show wave-like behavior such as interference and diffraction Example 4: Calculate the wavelength of an electron traveling at 1.24 x 10 7 m/s knowing that its mass is 9.11 x 10 -28 g. (1 Joule = 1kg.m 2 /s 2 ) Example 5: Calculate the wavelength of a baseball of mass 149.0 g traveling at 41.30 m/s. 1

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What is the most compelling evidence that suggests that light is wave-like? While the photoelectric effect shows that light behaves as particles, other evidence shows that it behaves like a wave. Diffraction provides strong evidence that light is a wave. To understand diffraction, we need to understand interference. Interference: It is the interaction between waves that leads to either a greater amplitude (constructive interference), or a smaller amplitude (destructive interference). Constructive Interference:
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## This note was uploaded on 10/28/2009 for the course CH 53130 taught by Professor Mccord during the Fall '09 term at University of Texas at Austin.

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Unit1_Chap12_SUM08Zumdhal-2 - In summary: Energy is...

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