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Taylor's experiment: 1. accurately measured the speed of light 2. locked together the phases of two light sources so that the interference pattern would not shift 3. showed that man's reaction time was much slower than the speed of light 4. showed that individual photons have wave characteristics

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?