Facts

The one about the photon of light has always been a bit ambigous to my understanding. It takes 170,000 years relative to your frame of reference (surely) but to the photon it takes mearly moments, as it is moving at the speed of light.

That's one I've always wondered about when scientist says were seeing the light from a star millions of years ago, which is true for us, but if times slows for the photon in relation to our reference frame due to it going at the speed of light, then it would be instant for the photo from one place to the other. It boggles my brain.
 
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No, it takes millions of years for the light to traverse the distance between us. It appears to be now, but everything we see happened some time before we see it. If you change our sort of reference frame so that what we see now is happening now, then your argument kind of makes sense, but it just isn't true.
 
care to post a link that rubbishes it. everything I've found so far seems to back it up. - not that I'm suggest anyone actual puts it to the test!

2 seconds on google...

http://www.bbc.co.uk/news/magazine-17610820

Verdict: Myth. The prince threatened the Welsh with execution if they did not leave Chester. Fortunately for Welsh people, even if this was intended to incite the people of Chester to kill, the prince's order has since been superseded by murder and manslaughter laws, as well as the universal right to life under the Human Rights Act.
 
The one about the photon of light has always been a bit ambigous to my understanding. It takes 170,000 years relative to your frame of reference (surely) but to the photon it takes mearly moments, as it is moving at the speed of light.

That's one I've always wondered about when scientist says were seeing the light from a star millions of years ago, but surely if times slows for the photon in relation to our reference frame due to it going at the speed of light, then it would be instant, and we actually see the stars as they are right now.

It's Einstein's theory of special relativity that explains it. He determined that the laws of physics are the same for all non-accelerating observers, and he showed that the speed of light within a vacuum is the same no matter the speed at which an observer travels. As a result, he found that space and time were interwoven into a single continuum known as space-time. Events that occur at the same time for one observer could occur at different times for another.

So in summation time doesn't slow for the photon, it remains constant.
 
The root of a real negative number is purely imaginary, the root of an imaginary number is complex. The number of complex solutions when you root an imaginary number is equal to the root amount eg. the nth root of i has n amount of complex solutions.

Not a fun fact but since the speed of light was mentioned earlier, thought i would come back and post a method to measure the speed of light at home or in the office with just the use of a ruler and a slice of cheese (or thin chocolate bar).

The speed of light is equal to the wavelength multiplied by the frequency. Pretty obvious why, frequency is the number of times the wave is repeated per second and the wavelength is the length of the wave, so it stands to reason that multiplying the length of a wave by the frequency gives the distance covered by light over a second.

So this gives us C= f * L

C=Speed of Light (m/s)
f=frequency (Hz)
l=wavelength (m)

so we just need to find out these two numbers of a wave to find the speed of light. Frequency can be easily found written on the microwave.

The wavelength will need to be measured with a ruler and your melty food of choice, cheese works best in my experience but i have heard of the odd chocolate user. First remove the rotating plate of your microwave, the plate is there to make sure energy is absorbed more evenly by rotating the food but since we want to measure the wavelength we don't want even heating. Then insert said cheese and turn it on for 15-25 seconds depending on the thickness of the slice. You are aiming to find melt lines in the cheese, not completely melt the cheese.

If we look at the shame of a sin or cosine wave we can imagine that these lines would represent half a wavelength, so measure the distance with a ruler and double it. This is your wavelength for the microwaves. Now times the wavelength in metres you have just found by the frequency in Hz to get a speed of light in m/s (because Hz essentially have the unit of measurement 'per second').

Post your answers here and be amazed to find how close you are to the speed of light and how small the margin of error is considering the basic tools and ease of measuring.
 
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