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drinkey
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In e=Mc2 Does c have to be exactly the speed of light? Can it not be a slightly bigger or smaller number? Or does C squared simply represent an enormous number?
drinkey said:In e=Mc2 Does c have to be exactly the speed of light? Can it not be a slightly bigger or smaller number? Or does C squared simply represent an enormous number?
drinkey said:In e=Mc2 Does c have to be exactly the speed of light?
The best answer is, I think the one by DrStupid:drinkey said:[..] I read the thread suggested but now my brain hurts! I am a novice that did not do physics at school but am now fascinated by the subject. I saw this somewhere where a question was asked about the energy in a kg of matter (rest)
This is determined by Einstein's equation E = mc2, where c = velocity of light = 3 x 108 meters/sec. So c2 = 9 x 1016. For 1 kg of mass therefore the equivalent energy is 9 x 1016 Joules, for 1 gram it is 9 x 1013 Joules.
Note units, in the SI system energy is in Joules, mass in kg, distances in meters. If you keep to these units you will get consistent results.
So I get the conversion I still don't know why (above example) it has to be 1016 and not say 1015...
The speed of light, denoted by the symbol "c", is a fundamental constant in physics that plays a crucial role in a wide range of scientific research. It is the maximum speed at which all matter and information in the universe can travel, and its precise value has been determined through numerous experiments and observations over the years.
The speed of light is considered to be a universal constant because it is the same for all observers, regardless of their relative motion or the motion of the source emitting the light. This is a key principle in Einstein's theory of relativity, which has been confirmed by countless experiments and is essential for our understanding of the laws of physics.
The first successful attempt to measure the speed of light was made by Danish astronomer Ole Rømer in the late 17th century. He observed the moons of Jupiter and noticed that their orbits were slightly longer when Earth was farther away from Jupiter, and slightly shorter when Earth was closer. From this, he was able to calculate the speed of light to be approximately 220,000 kilometers per second.
According to our current understanding of physics, nothing can travel faster than the speed of light. This is because as an object approaches the speed of light, its mass increases and it requires an infinite amount of energy to accelerate further. Therefore, it is considered to be a fundamental limit in the universe.
The speed of light has a profound impact on our everyday life, even though we may not always realize it. It allows us to communicate quickly through modern technologies such as the internet and cell phones, and enables us to see the world around us through light and other electromagnetic waves. It also plays a crucial role in fields such as telecommunications, astronomy, and medical imaging.