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49 views

Finding out the wavelength of Xray [closed]

A sheet of aluminum 1 mm thick reduces the intensity of a monochromatic x ray beam to 23.9% of at original value. what is the wave length of xray.
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1answer
96 views

Ways to experimentally control the chemical potential of a solid state system

When working in the grand canonical ensemble we write the grand potential as $\Omega = \Omega (T,V,\mu)$. In this case we are taking the chemical potential $\mu$ to be an independent variable. This ...
4
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1answer
147 views

Can Ohm's law break in metals?

I was rereading Purcell's Electricity and Magnetism as research for another question, and I found this passage: In metals Ohm's law is obeyed exceedingly accurately up to current densities far ...
3
votes
1answer
182 views

Experimental samples with rare earth metal

Many experiments, such as optical, superconductivity, etc, use the samples that involve rare earth metals and transition metals. Why are they used that often. Is the main reasons: They have the ...