The scientists found that the precursor wave front of a single photon always travels at c, like the signal velocity of large groups of photons.
科学家发现,单个光子的前驱波头一般以光速c传播,就像由大量光子携带的信号的传播速度一样。
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In fault location system based on traveling wave, the measurement accuracy of traveling wavevelocity influenced the fault location accuracy to a certain extent.