Which statement best summarizes the law of conservation of energy
a) when work is done, energy is lost.
b) heat flows from a warm body to a cold body.
c) if energy disappears in one form, it must reappear in another.
d) the fewer the number of valence electrons, the better the insulator

Option (C) is the correct answer.

Explanation:

According to law of conservation of mass, energy can neither be created nor it can be destroyed as it can only be transformed from one form to another.

For example, when ice melts at room temperature then it absorbs heat from its surroundings and converts into liquid state of water.

So, the heat energy absorbed by ice is used in breaking of bonds between ice particles that results in liquid form. Hence, energy from solid state disappears and it reappears in liquid form.

Thus, we can conclude that the statement, if energy disappears in one form, it must reappear in another, best summarizes the law of conservation of energy.

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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