How can you separate iron filings from sand through which process​

Process called magnetic separation

Explanation:

The magnetic separation is a process in which magnetically susceptible material is extracted from a mixture using magnetic force.

This method is also used to separate the mixture of sand and iron fillings as iron is attracted by magnet.

Use a magnet to separate the iron filings from sand since iron is magnetic

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:

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.