Some compounds are classified as acids or bases . the ph scale shows how acidic or how basic these compounds are the lower the ph the more acidic a compounds is the higher the ph the more basic it is . sodium hydroxide a compound commonly found in drain cleaners has a ph of about 13. which of these phrases describe sodium hydroxide

the answer could be (very basic) since options arent given

i will answer your question if you answer mine

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