22 votes

Alternate sky colors?

Rayleigh scattering results in scattering inversely proportional to the fourth power of the wavelength. So, no matter what the composition of the scatterer is, the blue will be scattered more than the ...
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  • 6,300
5 votes

Are the shapes of atomic orbitals direct consequence of the Schrödinger equation?

The shape of the orbitals are derived by the Schroedinger equation, more precisely if you look at the hydrogen atom you can separate the variables, the angular part actually determines the angular ...
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5 votes

Alternate sky colors?

Aside from scattering, an important contribution to sky color in a purely gaseous atmosphere is absorption. Already on the Earth we have stratospheric ozone which makes twilights blue (see Why is ...
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  • 26.3k
3 votes
Accepted

Do photosynthesis and respiration violate the law of conservation of energy?

I have been taught that for making one molecule of glucose in photosynthesis 18 ATP molecules are used up but in respiration, oxidation of the same glucose molecule releases 38 ATP In the Calvin ...
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3 votes

Under what conditions can molecules exist?

In computational chemistry, we approach this question from the Born-Oppenheimer approximation perspective, in a very pragmatic way. Consider we have an ensemble of electrons and nuclei. First, we ...
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  • 31
2 votes

Why does electrolytic conductance increase with dilution?

Conductivity is a measure how fast charges can travel in medium, i.e. $$ \sigma = -q \mu $$ where charge mobility is defined as : $$ \mu ={\frac {q\ell }{m^{*}v_{_{\rm {F}}}}}, $$ where $v_{_F}$ is ...
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1 vote

Do photosynthesis and respiration violate the law of conservation of energy?

Photosynthesis is driven by absorbing the energy of the light, whereas in non-photosynthesizing organisms the energy comes with food - i.e., the glucose is not resynthesized, but imported from ...
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  • 37.1k
1 vote

Are the shapes of atomic orbitals direct consequence of the Schrödinger equation?

I am trying to understand whether the shapes of the orbitals are inevitable given the standard model. The atomic electron orbitals of atomic physics come about because the atomic potential is ...
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  • 7,006

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