Appendix:Polish surnames. Polish surnames are known from the Middle Ages, but only 200 years ago did the inherited surnames become compulsory. The most common Polish names Nowak, Nowakowski, Nowacki, and Nowicki are variants meaning new, Przybyszewski and Przybylski mean he who has arrived.
Beta Waves. Beta Waves, sometimes also called the beta rhythm, is the frequency of the electrical activity in the brain that falls between 12 and 30 Hz and is the state that is associated with normal waking consciousness. These brain waves are classified as low and high amplitudes.
See Alpha decay. Beta is a particle, a highly energetic electron or positron ejected by decay of a neutron or proton in a radioactive isotope atom. See Beta decay. Gamma radiation comprises highly energetic photons above the x-ray energy range that may arise in nuclear decay or reach earth from space.. In one example, Cobalt-60 decays to release a beta particle followed by gamma radiation from the resulting nickel 60.