# Questions tagged [order-of-magnitude]

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Does any one know the order of magnitude of pressure inside a typical white dwarf (better with reference)? Thanks! I think it should be $m_e^4c^5/h^3$ (may be multiplied by $\pi$), which is $10^{22} \... 0answers 542 views ### Dimensional analysis to estimate order of magnitude of quantities In the Coursera course From the Big Bang to Dark Energy on several occasions dimensional analysis was used to estimate the scale of quantities. This almost seems like a contradiction in terms to me, ... 0answers 46 views ### Physical reason for light incoherence In my physics notes it is stated that the light phase changes every 10^-8 seconds, hence light from 2 light original light sources. I understand how light from incoherent light doesn't allow for ... 0answers 23 views ### how long does it take for a photo-conductor to become a conductor when exposed to light? How fast does a photo-conductor reach full conductivity when exposed to the appropriate wavelength of light? How fast does it cease to conduct when the radiation ceases? It might vary, so I could also ... 0answers 82 views ### Ignoring orders of magnitude in a problem I am so lost in this solution to a physics problem. In the problem I find the gravitational force on the Moon due to Earth and the gravitational force on the Moon due to the Sun They are about$1....
Suppose we have a generic system with hamiltonian $$H= JH_1 +\mu H_2$$ where $J$ and $\mu$ are couplings and $H_1$ and $H_2$ are just two dimensionless parts of the ...