Blue light ejects photoelectrons with more energy than green light Under the right circumstances light can be used to push electrons. This process is called the photoelectric effect and these electrons are called photoelectrons , but there is nothing special or different about them.
All electrons are identical to one another in mass, charge, spin, and magnetic moment.
Compared to later radio devices, the spark-gap generator was notoriously difficult to work with. The gap between terminals would often have to be smaller than a millimeter for a spark to generate in the receiver. Hertz found that he could increase the sensitivity of his spark-gap device by illuminating it with visible and later ultraviolet radiation. While this is interesting, it is hardly amazing. All forms of electromagnetic radiation transport energy and it is quite easy to imagine this energy being used to push tiny particles of negative charge from the surface of a metal where they are not that strongly confined in the first place.