How can you determine a speed of a moving train? Choices

divide the distance traveled by the time spent moving

divide the time spent moving by the direction traveled.

multiply the distance traveled by the the time spent moving

Multiply the kinetic energy by the distance traveled

We know to the equation of speed is distance divided by time so my opinion is that the most reasonable answer is 1. divide the distance traveled by the time spent moving.

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.

explanation:

your answer is "the 1950's"