Frequency is the that move past a point during a specific amount of time. frequency is measured in , and is classified as high, medium, or low. frequency is interpreted as the of a sound. intensity refers to the of a sound and is measured in . louder sounds the rate of nerve signals relayed to the brain.

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.