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

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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:
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

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.

Page1 / 5

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

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online