Name the source of all sound and tell how sound waves travel. Describe the parts of a sound wave and a light wave.
Explain the difference between amplitude and pitch.
Describe how sound waves are received by the ear.
List some substances through which sound can travel and through which light can travel.
Name the speeds of light and sound.
Describe the electromagnetic spectrum.

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.