There are different speeds of light travels. Light waves will travel through a glass window at roughly 286,000 mi/sec. is the true statement.
The speed of light was said to be critically examined by scientists have thoroughly examined. It is known to be expressed as a constant value which is often denoted in equations by the symbol c.It is said not to be that truly constant, but expressed in the maximum speed in a vacuum. The speed of light in km, is estimated to be almost about 300,000 kilometers per second. But it can be altered by changing media or with quantum interference. Since 286,000 is close to 300,000, then this is the true statement.
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