Archeologists have found fossil remains of some of the first land animals in layer C. It has been suggested that C-14 be used to data the fossils. Some archeologists have objected and suggested that it would be best to use U-238 or Pb-206 to date the rock layer instead. Why would they make such a suggestion ? A) Rocks do not contain any elemental carbon for radiometric dating purposes .
B) Carbon-14 is only found in living things; it can only be used to date remains .
C) C-14 has a very short half-life, 5700 years, and based on geologic history , layer may be several million years old .
D) C-14 has such a long half -, 570000 million years, it would be more appropriate to use a radioactive element with a shorter half- life.

would be false hope this out

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

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."