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.
Categorizing waves on this basis leads to three notable categories: transverse waves, longitudinal waves, and surface waves. A transverse wave is a wave in which particles of the medium move in a direction. to the direction that the wave moves. Suppose that a slinky is stretched out in a horizontal direction across the classroom and that a pulse is introduced into the slinky on the left end by vibrating the first coil up and down.