Sean E. Lake's user avatar
Sean E. Lake's user avatar
Sean E. Lake's user avatar
Sean E. Lake
  • Member for 9 years, 11 months
  • Last seen this week
100 votes
Accepted

How big would my telescope have to be if I wanted to see the Mars rover from my backyard?

44 votes

Why don't we use weights to store energy?

36 votes
Accepted

If Energy can be converted into mass, why can it not be converted into charge?

29 votes

Does the Earth's rotation affect redshift measurements?

28 votes

If reference frames are equally valid, then why do teachers say the geocentric view is wrong?

26 votes

How to calculate how many photons are in the universe?

26 votes
Accepted

Dirac once said that renormalization is just a stop gap procedure, and there had to occur a fundamental change in our ideas. Did something change?

26 votes

Is the fact that 100 kPa equals about 1 atmosphere accidental?

25 votes
Accepted

Why do convex lenses not disperse light like prisms, given that entry and exit points aren't parallel?

23 votes
Accepted

Why is the impedance of a resistor the same in time and frequency domains if the Laplace transform of a constant is not the same constant?

23 votes

Voyager: Is it in "orbit" and will it return?

23 votes

How do neutrinos pass through the sun so quickly?

23 votes

Is there any advantage in stacking multiple images vs a single long exposure?

21 votes
Accepted

Why do we equate an indefinite integral to a specific value?

20 votes

What is a "decade" as a unit of measure (ex. a decade of the EM spectrum)?

19 votes

What is the complete proof that the speed of light in vacuum is constant in relativistic mechanics?

18 votes
Accepted

For ideal classical gasses, in terms of the energy levels why do we ignore whether the particles are fermions or bosons?

18 votes
Accepted

Why do cosmic rays slow down when passing through the CMB?

16 votes
Accepted

Do Maxwell's equation describe a single photon or an infinite number of photons?

16 votes
Accepted

What's the reasons to use time-ordering operator?

16 votes

How long would a bubble made in the ISS last?

15 votes

How can I make edible gold sink in water without affecting the drinking-water quality?

14 votes
Accepted

Solid angle subtended by a circle

14 votes
Accepted

How do I Derive the Green's Function for $-\nabla^2 + m^2$ in $d$ dimensions?

13 votes

Do we need dark matter and dark energy, if the behaviour of the universe in its initial stages was similar to that of the Sun?

12 votes

If we were on the Moon would Earth appear to be in motion or at rest?

11 votes

Co and contravariant: tensors or components?

11 votes

How can a day be exactly 24 hours long?

11 votes

Why do we use potential for quantizing the electromagnetic field?

11 votes
Accepted

Why does symmetry reduce heat capacity?

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