After an explosion far away, a person working on a farm first senses vibrations in the ground, then hears the explosion. what accounts for the time between the vibrations and the noise? a) wind slows down the noise in the air. b) the landscape affects the way sound travels through the air. c) sound travels faster through the ground than through the air. d) the speed of sound is faster through the air than in the ground.

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?