Word: photons
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Dates: during 1930-1939
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...Millikan's persistent view after 15 years is that cosmic rays are photons, or particles of light. He believes they originate from the creation of matter between the stars. But where they originate was not the nub of last week's symposium. What they are was the point. Dr. Compton declared again that they were electrons (and/or photons) coming to earth from beyond the atmosphere, or originating at the top of the atmosphere. When a photon hits an atom in the atmosphere, the atom emits an electron. When an electron hits an atom, the atom emits a photon...
When a smallest thing is discovered it must be observed more than once to be believed. In February, Cambridge University's Dr. James Chadwick proclaimed the existence of the neutron, new smallest thing (TIME, March 7). With the proton (positive electricity), electron (negative electricity) and photon (light particle), this made four smallest things. But the neutron is elusive, hard to find. It contains no detectable electric charge. It leaves no marks in the form of ionized or electrified particles when it passes through a gas. Having no charge, it is not repelled by charged atoms. Hence...