/u/iOfTheApple's posts in /r/askscience

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What happens to the speed of photons emitted by a moving light source? Do they travel faster than the speed of light, c?

3296 upvotes

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According to Maxwell's theory of Electromagnetism, visible light is a combination of fluctuating Electric and Magnetic fields. So why don't we see a compass needle being deflected in the presence of, say, a light bulb?

10 upvotes

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If light is a result of changing electric and magnetic field, can I create visible light by using just an A.C source and a wire?

7 upvotes

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If the Einstein Field equations are so incredibly difficult to solve, how did he Einstein derive them in the first place?

6 upvotes

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How do changing electric and magnetic fields explain how light travels in space?

2 upvotes

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How does Newton's theory of gravity and Einstein's theory of relativity give almost exactly the same answer even though they are based on completely different ideas?

1 upvotes

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If Quantum Foam exists, why don’t we see random explosions from matter-antimatter pairs annihilating?

1 upvotes

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Why does the Theory of Relativity and the Quantum theory not agree with each other?

1 upvotes

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In the double-slit expermient which methods are used to measure which path a quatum particle takes, other than a light source?

1 upvotes

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Why does the earth have some sideways speed, keeping it from falling into the Sun?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
What happens to the speed of photons emitted by a moving light source? Do they travel faster than the speed of light, c?	3296
According to Maxwell's theory of Electromagnetism, visible light is a combination of fluctuating Electric and Magnetic fields. So why don't we see a compass needle being deflected in the presence of, say, a light bulb?	10
If light is a result of changing electric and magnetic field, can I create visible light by using just an A.C source and a wire?	7
If the Einstein Field equations are so incredibly difficult to solve, how did he Einstein derive them in the first place?	6
How do changing electric and magnetic fields explain how light travels in space?	2
How does Newton's theory of gravity and Einstein's theory of relativity give almost exactly the same answer even though they are based on completely different ideas?	1
If Quantum Foam exists, why don’t we see random explosions from matter-antimatter pairs annihilating?	1
Why does the Theory of Relativity and the Quantum theory not agree with each other?	1
In the double-slit expermient which methods are used to measure which path a quatum particle takes, other than a light source?	1
Why does the earth have some sideways speed, keeping it from falling into the Sun?	1