免费光子能量计算器
根据频率或波长计算光子的能量E=hf。
nm
Energy (J)
0.000000 J
频率545,077,196,363,636 Hz
Energy (eV)2.2545 eV
Energy (J) vs Wavelength
公式
## Photon Energy A photon's energy is proportional to its frequency and inversely proportional to its wavelength. ### Formula **E = h * f = h * c / lambda** where h = 6.626 x 10^-34 J·s is Planck's constant and c = 3 x 10^8 m/s. To convert to electron volts, divide by 1.602 x 10^-19.
计算示例
A green photon with wavelength 550 nm.
- 01f = c / lambda = 3e8 / 550e-9 = 5.45e14 Hz
- 02E = h * f = 6.626e-34 * 5.45e14
- 03E = 3.614e-19 J
- 04E = 3.614e-19 / 1.602e-19 = 2.257 eV
常见问题
What is a photon?
A photon is a quantum (discrete packet) of electromagnetic energy. It has no mass and always travels at the speed of light.
Why do different colors have different energies?
Color corresponds to wavelength. Shorter wavelengths (violet/blue) have higher frequency and thus higher energy per photon.
What energy do X-ray photons have?
X-ray photons have energies from about 100 eV to 100 keV, much higher than visible light photons (1.8-3.1 eV).
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