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1. The speed of light in a vacuum is approximately 299,792,458 meters per second, or 300,000 kilometers per hour.
光在真空中的速度大约是每秒299,792,458米，或者每小时30万公里。
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2.The frequency of the radio waves was measured to be 6.5 GHz, which means it travels at the speed of light.
无线电波的频率被测量为6.5吉赫，这意味着它以光速传播。
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3. In the case of microwaves, the frequency range is from 300 MHz to 300 GHz, which corresponds to wavelengths ranging from 1 mm to 1 mm.
对于微波来说，频率范围是从300兆赫到300吉赫，这对应着波长从1毫米到1毫米的范围。