Acharge q of 7.3 × 10^15 coulomb moves from point a to point b in an electric field. if the potential energy of the charge at point a is 3.5 × 10^-12 joules and that at point b is 1.3 × 10^-12 joules, what is the potential difference between point a and b?

a. 1.3 × 10^2 volts
b. 3.0 × 10^2 volts
c. 3.5 × 10^3 volts
d. 6.8 × 10^3 volts

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?

Energy flows from the producer level to the level. is called

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)