The drawing shows two loudspeakers 1 metre apart. Both speakers are connected to the same signal generator, so both speakers are producing exactly the same sound waves. If you walk along line A–B you will hear the sound changing from loud to quiet and back again. Explain why the loudness of the sound changes as you walk along line A-B.

Any color picture tube and electric field exerts a net force of magnitude 1.68x 10^-13 n on an electron the rest mass of an electron is 9.11 x 10^-13 what is the electron acceleration?

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

What is the single most important equation in all of physics?