Visible light travels at a speed 3.0 × 108 of m/s. if red light has a wavelength of 6.5 × 10–7 m, what the frequency of this light? a) 2.2 × 10–15 hz b) 2.0 × 102 hz c) 3.0 × 108 hz d) 4.6 × 1014 hz

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.