Light particles - called photons - carry a packet of energy that depends on their frequency.
光束粒子——称为光子——携带的能量取决于它们的频率。
2
A photon is a quantum of light, or the smallest possible packet of light at a given wavelength.
光子就是光量子，或者以特定波长可能存在的最小的光信息体。
3
By using a fiber to postpone light pulse output from CuBr laser, the light speed can be determined by the time that light wave packet center traversed.