People I
A photographer wants to share her photos wi
other parts of the world.
What are two reasons the photographer would choose a digital signal rather
than an analog signal to share the photos?
A. The digital signal is less vulnerable to noise and more likely to
arrive intact.
B. The digital signal moves gradually between an infinite number of
values.
C. The digital signal could easily lose information because of noise
over long distances.
D. The digital signal can be copied many times without losing
quality

d is the correct answer

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

elctricity and magnet is conversion to it