User KF Gauss

81 votes

How do I experimentally measure the surface area of a rock?

answered Nov 10, 2019 at 19:07

21 votes

Accepted

Why no proton microscopes? Proton diffraction; or proton scattering experiments? Proton crystallography?

answered Aug 23, 2020 at 6:40

19 votes

Reverse of diffraction

answered Jun 23, 2019 at 22:04

17 votes

Isotopes and electron transitions

answered Jan 9 at 3:51

15 votes

Accepted

Why do we even need RF cavities to accelerate particles?

answered Jul 23, 2022 at 8:45

15 votes

Accepted

Limit on how many photons can hit a surface

answered Dec 25, 2022 at 5:09

9 votes

What is the minimum number of metal atoms necessary to make a mirror?

answered May 9, 2019 at 10:48

9 votes

Accepted

What colour is an electron?

answered Feb 25, 2019 at 5:08

9 votes

The difference between optical phonons and acoustic phonons in terms of energy absorption

answered Apr 8, 2019 at 16:57

9 votes

Why aren't particles constantly "measured" by the whole universe?

answered Feb 15, 2019 at 9:24

8 votes

Accepted

Why does a transition between 2 $s$-orbitals work for cesium's clock transition?

answered Jan 30, 2023 at 2:15

8 votes

Why are magnetic monopoles "incompatible" with quantum mechanics?

answered Apr 25, 2022 at 6:19

8 votes

Do superconducting materials have "zero" work function?

answered Sep 15, 2023 at 10:15

7 votes

Accepted

Evading the $J=0$ to $J'=0$ forbidden selection rule?

answered Oct 29, 2022 at 18:57

7 votes

Accepted

How does the wavefunction inherit the symmetries from the Hamiltonian?

answered Jan 8, 2022 at 3:25

7 votes

Do hadrons have color moments?

answered Jan 26, 2021 at 3:37

7 votes

Thermal conductivity of superconducting material

answered Feb 10, 2021 at 0:16

6 votes

Why does diamond-graphite phase digram not contain a critical point?

answered Jun 9, 2020 at 6:02

6 votes

Why don't we have a "Cooper pair" of two holes in a superconductor?

answered Jul 10, 2020 at 21:55

6 votes

Accepted

Is number of photons undefined for a classical EM wave?

answered Aug 11, 2020 at 6:38

6 votes

Accepted

Are electrostatic forces enough to trap charged particles?

answered Jul 31, 2023 at 1:45

6 votes

Why can't the density difference between the liquid and solid be an appropriate order parameter for liquid-to-solid transition?

answered Jul 29, 2017 at 5:11

5 votes

Accepted

Does phononic "Superconductivity" exist?

answered Jul 26, 2017 at 5:47

5 votes

Accepted

Where does Huygens–Fresnel principle follow from?

answered Apr 6, 2017 at 23:02

5 votes

Accepted

Matsubara Field Theory - what does imaginary time $\tau$ in $G(\tau,\mathbf{x})$ mean?

answered Jan 29, 2018 at 14:51

5 votes

Why is the k=0 phonon neglected when calculating Debye-Waller factor?

answered Feb 18, 2019 at 5:12

5 votes

How is the Geometric Phase measured in the experiment?

answered Jul 3, 2022 at 14:58

5 votes

Accepted

Is there a three-body exclusive interaction?

answered Sep 10, 2020 at 13:58

5 votes

What is QED about "Cavity QED"?

answered Nov 12, 2019 at 13:29

4 votes

Accepted

Do excited states of hydrogen give cosmologically relevant hyperfine transitions?

answered May 7, 2023 at 2:33

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135 Answers

How do I experimentally measure the surface area of a rock?

Why no proton microscopes? Proton diffraction; or proton scattering experiments? Proton crystallography?

Reverse of diffraction

Isotopes and electron transitions

Why do we even need RF cavities to accelerate particles?

Limit on how many photons can hit a surface

What is the minimum number of metal atoms necessary to make a mirror?

What colour is an electron?

The difference between optical phonons and acoustic phonons in terms of energy absorption

Why aren't particles constantly "measured" by the whole universe?

Why does a transition between 2 $s$-orbitals work for cesium's clock transition?

Why are magnetic monopoles "incompatible" with quantum mechanics?

Do superconducting materials have "zero" work function?

Evading the $J=0$ to $J'=0$ forbidden selection rule?

How does the wavefunction inherit the symmetries from the Hamiltonian?

Do hadrons have color moments?

Thermal conductivity of superconducting material

Why does diamond-graphite phase digram not contain a critical point?

Why don't we have a "Cooper pair" of two holes in a superconductor?

Is number of photons undefined for a classical EM wave?

Are electrostatic forces enough to trap charged particles?

Why can't the density difference between the liquid and solid be an appropriate order parameter for liquid-to-solid transition?

Does phononic "Superconductivity" exist?

Where does Huygens–Fresnel principle follow from?

Matsubara Field Theory - what does imaginary time $\tau$ in $G(\tau,\mathbf{x})$ mean?

Why is the k=0 phonon neglected when calculating Debye-Waller factor?

How is the Geometric Phase measured in the experiment?

Is there a three-body exclusive interaction?

What is QED about "Cavity QED"?

Do excited states of hydrogen give cosmologically relevant hyperfine transitions?