User Gilbert

42 votes

Why does my beveled mirror make triplicate "ghosts"?

answered Sep 11, 2017 at 1:21

42 votes

Accepted

Super Fast Message

answered Oct 19, 2017 at 17:37

30 votes

If you were invisible, would you also be cold?

answered Dec 7, 2021 at 22:07

26 votes

Why does the wave velocity of EM signals in a wire depend on the insulator's permittivity?

answered Jan 26, 2022 at 20:58

24 votes

How can you measure the zero resistance in a superconductor?

answered Jul 14, 2021 at 20:28

24 votes

Why is the potential energy of a spring the same when it is compressed and stretched?

answered Sep 6, 2017 at 13:55

24 votes

What's the physics behind XKCD #2027 (time between lightning flash and radio wave burst)?

answered Aug 1, 2018 at 14:44

22 votes

Accepted

Reversed First Joule's Law : heating a resistor produce voltage?

answered Sep 8, 2017 at 18:54

20 votes

What is Chirped Pulse Amplification, and why is it important enough to warrant a Nobel Prize?

answered Oct 8, 2018 at 1:52

19 votes

Why aren't all dielectrics transparent?

answered May 25, 2018 at 13:08

17 votes

Why Is an Inhomogenous Magnetic Field Used in the Stern Gerlach Experiment?

answered Nov 26, 2020 at 22:17

17 votes

Accepted

Is the specular reflection on a polished gold sphere white or gold in colour?

answered Jun 17, 2019 at 4:09

15 votes

Does Pythagoras theorem hold for length contraction according to Special relativity?

answered Jul 20, 2021 at 1:54

15 votes

What is the difference between a transparent material and an opaque one at the atomic level?

answered Oct 14, 2018 at 18:12

14 votes

Is there a frame of reference in which I was born before I was conceived?

answered Mar 4, 2019 at 16:18

14 votes

Speed of electrons in a current-carrying metallic wire: does it even make sense?

answered Feb 23, 2018 at 6:25

13 votes

How is silver a better conductor than platinum?

answered Oct 28, 2017 at 1:34

12 votes

Accepted

Number of bands in 1D tight-binding model

answered Feb 24, 2018 at 21:04

11 votes

Why did I measure the magnetic field to vary exponentially with distance?

answered Dec 4, 2020 at 2:53

11 votes

Crystals and Earnshaw's theorem

answered Oct 8, 2020 at 23:58

11 votes

Will a planet rotate if it is the only being in the universe?

answered Jan 4, 2022 at 3:47

10 votes

Did LIGO measurements prove that the speed of gravity equals the speed of light?

answered Mar 21, 2021 at 15:43

9 votes

What is meant by 2D fourier transform of an image?

answered Dec 17, 2021 at 18:45

8 votes

Accepted

What are the physical processes involved in feeling warm from the sunlight?

answered Apr 8, 2021 at 14:02

8 votes

What does the "true" visible light spectrum look like?

answered Feb 11, 2021 at 3:09

8 votes

What is the source for Osmium's colour?

answered May 29, 2018 at 14:19

7 votes

Why do metals have high optical reflectivity?

answered Aug 27, 2018 at 20:20

7 votes

Does a reflection still transfer momentum to an mirror?

answered Oct 10, 2017 at 19:09

7 votes

Accepted

Why is there emissivity + reflectivity + transmittance = 1?

answered Aug 29, 2017 at 11:29

6 votes

Why is $E=-dV/dx$?

answered Sep 12, 2017 at 23:23

Stack Exchange Network

370 Answers

Why does my beveled mirror make triplicate "ghosts"?

Super Fast Message

If you were invisible, would you also be cold?

Why does the wave velocity of EM signals in a wire depend on the insulator's permittivity?

How can you measure the zero resistance in a superconductor?

Why is the potential energy of a spring the same when it is compressed and stretched?

What's the physics behind XKCD #2027 (time between lightning flash and radio wave burst)?

Reversed First Joule's Law : heating a resistor produce voltage?

What is Chirped Pulse Amplification, and why is it important enough to warrant a Nobel Prize?

Why aren't all dielectrics transparent?

Why Is an Inhomogenous Magnetic Field Used in the Stern Gerlach Experiment?

Is the specular reflection on a polished gold sphere white or gold in colour?

Does Pythagoras theorem hold for length contraction according to Special relativity?

What is the difference between a transparent material and an opaque one at the atomic level?

Is there a frame of reference in which I was born before I was conceived?

Speed of electrons in a current-carrying metallic wire: does it even make sense?

How is silver a better conductor than platinum?

Number of bands in 1D tight-binding model

Why did I measure the magnetic field to vary exponentially with distance?

Crystals and Earnshaw's theorem

Will a planet rotate if it is the only being in the universe?

Did LIGO measurements prove that the speed of gravity equals the speed of light?

What is meant by 2D fourier transform of an image?

What are the physical processes involved in feeling warm from the sunlight?

What does the "true" visible light spectrum look like?

What is the source for Osmium's colour?

Why do metals have high optical reflectivity?

Does a reflection still transfer momentum to an mirror?

Why is there emissivity + reflectivity + transmittance = 1?

Why is $E=-dV/dx$?