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🌊 波长频率能量换算Wavelength, Frequency & Photon Energy
电磁波波长、频率和光子能量互算（c = λf，E = hf），并显示所属波段。Convert between wavelength, frequency and photon energy (c = λf, E = hf) and show the band.
使用说明与常见问题How-to & FAQ
「波长频率能量换算」是什么？What is the Wavelength, Frequency & Photon Energy?
电磁波波长、频率和光子能量互算（c = λf，E = hf），并显示所属波段。Convert between wavelength, frequency and photon energy (c = λf, E = hf) and show the band.
如何使用「波长频率能量换算」？How do I use the Wavelength, Frequency & Photon Energy?
在「波长频率能量换算」中，填写「输入值」、「单位」等参数，结果会随输入实时计算并显示在下方。In the Wavelength, Frequency & Photon Energy: Fill in "Input value", "Unit"; results are recalculated instantly as you type.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「波长频率能量换算」使用教科书标准公式，并列出所用公式和中间值，适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Wavelength, Frequency & Photon Energy uses standard textbook formulas and shows them, which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「波长频率能量换算」免费吗？需要注册吗？Is the Wavelength, Frequency & Photon Energy free? Do I need an account?
「波长频率能量换算」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Wavelength, Frequency & Photon Energy is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.