Imagine that the source is to the right of the listener, so that the positive reference direction (from the listener to the source) is in the +x direction. if the listener is stationary, what value does fl approach as the source's speed approaches the speed of sound moving to the right? imagine that the source is to the right of the listener, so that the positive reference direction (from the listener to the source) is in the direction. if the listener is stationary, what value does approach as the source's speed approaches the speed of sound moving to the right? 0 12fs 2fs it approaches infinity.

newton's first law of motion

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

it is a negative acceleration