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E is energy in Joules (J) or Electron Volts (eV).

h is Planck's Constant. When using joules, Planck's constant is 6.63*10^-34 Joule*seconds (J*s). When using electron volts, Planck's constant is 4.14*10^-15 electron volt*seconds (eV*s).

f is the frequency of light in inverse seconds or 1/second

Q: What are the units of h in the equation E equals hf?

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w = hf - E

The 'c' in that equation stands for the speed of light in a vacuum. If the equation is being evaluated in metric units, then it's 299,792,458 meters per second. If in English units, then it's 186,282 miles per second.

Albert Einstein.Except that the equation was e = mc2

Albert Einstein

The formula for energy. E is for energy(Units = Joules) P is for power(Units = Watts) T is for time(Units = Seconds)

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w = hf - E

E = energy energy = mass X velocity of light squared The common form of the equation in conventional units is E = mc^2, but in relativistic units (where the speed of light c is 1) the equation reduces to just E = m which is much easier to calculate. The factor c^2 is just a units conversion constant.

The 'c' in that equation stands for the speed of light in a vacuum. If the equation is being evaluated in metric units, then it's 299,792,458 meters per second. If in English units, then it's 186,282 miles per second.

Albert Einstein.Except that the equation was e = mc2

The energy of a photon (E) is directly proportional to its frequency (f) through the equation E = hf, where h is the Planck constant. The frequency of a wave is inversely proportional to its wavelength (λ) through the equation f = c/λ, where c is the speed of light. Combining these two equations gives the equation E = hc/λ, which relates energy and wavelength.

Albert Einstein.

An equation where e = 4

Albert Einstein

A linear equation in the single variable, e.

The formula for energy. E is for energy(Units = Joules) P is for power(Units = Watts) T is for time(Units = Seconds)

Einstein used the equation E = hf to explain the photoelectric effect, where E is the energy of a photon, h is Planck's constant, and f is the frequency of the light. This equation shows that the energy of a photon is directly proportional to its frequency.

The Energy in a specific piece of matter is equal to its mass times the square of the speed of light.You might usefully investigate the units in this equation: was Einstein using ergs, grams, kilometers or what.