When a sound source is moving toward the observer, the observer will hear a higher pitch. This is due to (2 points) a a decrease in the amplitude of the sound wave b a decrease in the frequency of the sound wave c an increase in the frequency of the sound wave d an increase in the amplitude of the sound wave

It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc