The light ray is entering the water from the air. how should the light ray respond to the change of medium? a. it will slowdown and bend upward b. it will speed up and bend upward c. it will slow down and bend downward d. it will speed up and bend upward

The flame produced by the burner of a gas (propane) grill is a pale blue color when enough air mixes with the propane (c3h8) to burn it completely. for every gram of propane that flows through the burner, what volume of air is needed to burn it completely? assume that the temperature of the burner is 195.0°c, the pressure is 1.05 atm, and the mole fraction of o2 in air is 0.210.