Photons are units or packets of electromagnetic energy. They carry no charge or mass.
While, electrons are constituents of an atom that are negatively charged and associated with a certain mass. In fact, electrons in an atom can get excited when they absorb photons of characteristic energy from electromagnetic radiation.
The similarity between photons and electrons is that both can behave as particles as well as waves.
The FitnessGram™ Pacer Test is a multistage aerobic capacity test that progressively gets more difficult as it continues. The 20 meter pacer test will begin in 30 seconds. Line up at the start. The running speed starts slowly, but gets faster each minute after you hear this signal. [beep] A single lap should be completed each time you hear this sound. [ding] Remember to run in a straight line, and run as long as possible. The second time you fail to complete a lap before the sound, your test is over.