Zinc oxide protect the lifeguards from damaging uv sunlight. how does this cream protect from the uv rays of the sun? a. the cream is opaque and allows the uv rays to pass through your skin safely. b. the cream is opaque and reflects the uv rays before they reach the skin's surface. c. the cream is transparent and transmits the uv rays as they reach the skin's surface. d. the cream is transparent and absorbs the uv rays after they reach the skin's surface.

B.The cream is opaque and reflects the UV rays before they reach the skin's surface.

a displacement distance is size of displ

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