The marble rolled with an average speed of 2 m/s. How far did the marble go? Tom rode his bike at 2 miles an hour for 12 miles. How long did it take him to finish his ride?
Sam walked for 5 miles. What was Steve's average speed?
If a log rolled for 10 minutes and went 1 mile, what was the average speed of the log?

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

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explanation:

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