Negative amplitude means the signal is attenuated relative to a reference point, so if you see e.g. -20dB, it means the signal is 1/10th of the reference value. dB on it's own is unitless, so you will see things like dBm (relative to 1mW â 0dB = 1mW), or dBV (relative to 1V â 0dB = 1V).
In Colorado, the offer is valid at the Denver Zoo and the Denver Art Museum. However, the Denver Art Museum is Sunday only, because they already offer free admission to everyone on the first Saturday of the month. This list does change, so check the Museums on Us website, before you go.
Most customers know July 11 simply as Free Slurpee Day. In whatâs become an annual event, 7-Eleven stores are giving away one free Slurpee per customer on July 11. Besides generating goodwill among customers, the event has proved curiously successful in boosting sales of Slurpees on the day of the giveaway.