Categories
Tags
Physical-constants
New post in Physical-constants
Why do we obtain classical physics by taking the limit of Planck's constant to zero?
December 29th, 2020
physical-constants
quantum-mechanics
semiclassical
classical-mechanics
Is the fine structure constant actually a constant or does its value depend on the energy scale?
August 1st, 2022
physical-constants
quantum-electrodynamics
What if the size of the Universe doubled?
February 28th, 2020
cosmology
universe
physical-constants
spacetime
Why do we need constants?
April 18th, 2020
units
physical-constants
Planck mass is about the mass of one eyebrow hair
August 1st, 2022
order-of-magnitude
mass
scales
physical-constants
Why are the classical electron radius, the Bohr radius and the Compton wavelength of an electron related to each other?
August 1st, 2022
atomic-physics
physical-constants
quantum-mechanics
electromagnetism
Why is the Planck length considered fundamental, but not the Planck mass?
August 1st, 2022
physical-constants
Is the speed of light in vacuum always the same value?
August 1st, 2022
special-relativity
metrology
physical-constants
speed-of-light
Do we take gravity = 9.8 m/s² for all heights when solving problems? Why or why not?
August 1st, 2022
approximations
newtonian-gravity
physical-constants
Is there an explanation for the 3:2:1 ratio between the electron, up and down quark electric charges?
August 1st, 2022
quantum-chromodynamics
standard-model
particle-physics
color-charge
physical-constants
Can the accuracy in Planck's constant ever be increased?
August 1st, 2022
error-analysis
metrology
physical-constants
What constant varies in the fine structure constant?
September 1st, 2020
renormalization
standard-model
physical-constants
Why can you remove the gravitational constant from a computer game simulation?
February 2nd, 2020
gravity
dimensional-analysis
physical-constants
Can Planck's constant be derived from Maxwell's equations?
August 1st, 2022
quantum-mechanics
dimensional-analysis
physical-constants
Physical Significance of the Planck Density
August 1st, 2022
quantum-gravity
physical-constants
density
Is there a relationship between the Cosmological constant and the Hubble constant?
August 1st, 2022
cosmological-constant
cosmology
physical-constants
Can someone explain Planck's constant simply?
December 6th, 2020
quantum-mechanics
physical-constants
How is "little $h$" measured in cosmology? The dimensionless parameter from the Hubble constant, $H_0$
August 1st, 2022
cosmology
astronomy
space-expansion
physical-constants
Is the Planck length the limit below which our physics does not make sense? And if so, why is that true?
March 30th, 2020
spacetime
quantum-gravity
physical-constants
How can Planck units be consistent with conflicting dimensions of mass?
January 31st, 2020
quantum-gravity
dimensional-analysis
units
absolute-units
physical-constants
Why are $\mu_0$ and $\epsilon_0$, which appear in electrostatics and magnetostatics, related to the speed of light which appears in electrodynamics?
July 26th, 2020
electricity
electromagnetism
physical-constants
speed-of-light
Why is the string length around the Planck length?
March 23rd, 2022
physical-constants
dimensional-analysis
string-theory
scales
order-of-magnitude
Is the Bohr radius deprecated?
June 21st, 2020
quantum-mechanics
absolute-units
hydrogen
physical-constants
atomic-physics
Why is there a constant in the ideal gas law?
April 18th, 2020
physical-constants
thermodynamics
ideal-gas
Is speed of light and sound rational or irrational in nature?
January 23rd, 2020
mathematics
physical-constants
units
speed-of-light
dimensional-analysis
Gravitational constant in higher dimensions?
August 1st, 2022
compactification
physical-constants
gravity
string-theory
spacetime-dimensions
What's keeping us from simply redefining Avogadro's Number / the Mole as a definite integer?
September 28th, 2020
metrology
physical-constants
si-units
Is the fine-structure constant a parameter of the standard model?
August 1st, 2022
standard-model
physical-constants
Why does the fine-structure constant $α$ have the value it does?
January 23rd, 2021
electromagnetism
quantum-electrodynamics
renormalization
physical-constants
Has the speed of light changed over time?
April 24th, 2020
physical-constants
speed-of-light
cosmology
←
1
2
3
4
5
→