Examlex
Process of Science: In the discovery of quasars,the radio source 3C273 was found to have strong emission lines at wavelengths that did not correspond to any known element on Earth.Suppose a scientist postulated that they had discovered a new element that only existed in these powerful radio sources.How would you test this?
Electroencephalograph (EEG)
A device used to record electrical activity of the brain through electrodes placed on the scalp.
Delta Waves
Slow brain waves predominantly observed in the deepest stages of sleep, indicating deep sleep and unconsciousness.
Stage 3 Sleep
A deep stage of sleep characterized by low frequency delta waves, essential for restorative sleep functions.
Electroencephalograph (EEG)
A device used to record the electrical activity of the brain through electrodes placed on the scalp.
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