Refraction of sound waves often takes place when:
a. there are temperature differences in air
b. there are walls around a room to bounce back sound
c. sound wave frequencies are increased
d. complete sound waves slow down

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

The slope of a velocity time graph over any interval of time gives the during that interval

What occurs during a combustion reaction