What evidence is there to suggests that light is a form of energy?

Answer 1

SoundSound is a form of energy because energy always carried sound waves.

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Essentially, sound is a wave of kinetic energy (a mechanical wave) carried through a medium (air in our everyday experience). Drop a pen on the table in front of you. When the pen hits the table, all the kinetic energy you gave it before dropping it has been converted to other forms of energy. Some is absorbed by the table in the form of heat, and some is absorbed into the pen as heat. Some was absorbed by the air on its way down. The pen may have bounced, and all that movement represents the loss of the original energy. When the pen strikes the table, some of the energy is transmitted to the air as an outward spherical pressure front. The molecules of air continue pushing outward and then retracting back because of the trough of lower pressure that is formed behind it. It is very much like waves in a pond; the wave progresses, but the water itself doesn't move very much. When the expanding front of pressure hits something, some of the energy bounces off, and some is absorbed, depending on the materials and design of the object. Whatever is absorbed is in the form of very small quantities of heat. The sound that you hear when you drop the pen is actually some of the kinetic energy you put into the pen, now converted into sound waves.

Answer 2

For example, intereference experiments, such as the double-slit experiment.

For example, intereference experiments, such as the double-slit experiment.

For example, intereference experiments, such as the double-slit experiment.

For example, intereference experiments, such as the double-slit experiment.

Answer 3

If you place a piece of black iron out in the sun the light will be absorbed by the black iron. If after an hour you feel the iron it will be hot. Heat is energy and the energy has come form the light, so light is a form of energy.

Answer 4

Light can exhibit characteristics of energy such as being able to do work and causing a change in matter, like creating heat when absorbed by an object. Additionally, the photoelectric effect demonstrates that light can transfer energy to electrons, causing them to be ejected from a material. These observations support the idea that light is a form of energy.

Answer 5

Light falling on matter raises its temperature. This is evidence that light is a form of energy.

Answer 6

Because it is created by energy and can be harnessed for energy, hence solar panels.

Answer 7

For example, intereference experiments, such as the double-slit experiment.