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.
Party for the Planet. Party for the Planet is the Zooâs celebration of Earth Day where we bring eco-conscious members of the community together to help share the message of conservation. From 10:00 a.m. to 3:00 p.m. the Zoo will spotlight conservation with fun activities, face painting, and contests for children.