Using the rules for significant figures, what do you get when you subtract 15.54 from 508.9538?

493.41

Explanation: We have been asked to subtract 15.54 from 508.9538.

Thus 508.9538 - 15.54 = 493.4138

By using the rules for significant figures for subtraction, round the answer to the least number of places to the decimal point of any number in the problem. As one number contains 2 decimal places and the other number contains 4 decimal places.

Thus the answer should have 2 decimal places. Thus the answer should be 493.41.

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