- #1
Dgonzo15
- 14
- 0
Energy is E=γmc^2, but when I calculate this, will my result be in joules? I am unsure what the units are when I calculate it, and I keep hearing people saying joules.
Also, what is PJ and MJ?
Also, what is PJ and MJ?
Dgonzo15 said:Energy is E=γmc^2, but when I calculate this, will my result be in joules? I am unsure what the units are when I calculate it, and I keep hearing people saying joules.
Also, what is PJ and MJ?
Dgonzo15 said:So how would I calculate the energy of a photon? Since a photon travels at c, gamma (in E=γmc^2) would be undefined, so it doesn't make any sense to calculate the energy of a photon.
Dgonzo15 said:So how would I calculate the energy of a photon? Since a photon travels at c, gamma (in E=γmc^2) would be undefined, so it doesn't make any sense to calculate the energy of a photon.
Also, are photons considered to have mass, because mass is also a factor in E=γmc^2.
Dgonzo15 said:Also, are photons considered to have mass, because mass is also a factor in E=γmc^2.
Dgonzo15 said:OK, so the formula E^2=P^2... reduces to E=pc for photons since photons have zero REST mass. Since they have zero REST mass, what is their mass when they are moving at c? You would need to know their mass in order to calculate p so you can calculate E when they are moving, right?
A joule is a unit of energy, named after the English physicist James Prescott Joule. It is equal to the amount of work done by a force of one newton acting through a distance of one meter. In the context of relativistic energy, a joule is the unit used to measure the amount of energy an object has due to its motion relative to an observer.
Relativistic energy is calculated using the famous equation E=mc^2, where E represents the energy, m represents the mass of the object, and c represents the speed of light. The unit of energy, joules, is used to express the value of E in this equation.
Yes, joules can be used to measure both kinetic energy and potential energy in relativistic contexts. Kinetic energy is the energy an object possesses due to its motion, and potential energy is the energy an object has due to its position in a force field. Both of these types of energy can be measured in joules in the context of relativistic energy calculations.
Relativistic energy calculations differ from classical energy calculations in that they take into account the effects of special relativity, such as time dilation and length contraction. In classical energy calculations, these effects are not considered and the equations used are simpler. However, in extreme cases where objects are moving at very high speeds, relativistic energy calculations are necessary for accurate results.
No, joules are not the only unit used to measure relativistic energy. Another commonly used unit is electron volts (eV), which is equal to the amount of energy gained by an electron when it is accelerated through a potential difference of one volt. This unit is often used in particle physics and nuclear physics, where energies involved are very high.