Distance using hubble's law ii. find the percent difference (% = |a-o|/a × 100) between the actual (a) distance values and calculated (o) distance values using the recessional velocities for the virgo and corona borealis clusters (vvirgo = 1,200 km/s, dvirgo = 17 mpc; vcorona borealis = 22,000 km/s, dcorona borealis = 310 mpc). use h = 70 km/s/mpc. the percent difference for the virgo = %the percent difference for the corona borealis = %at which distance, the closer or further one, is hubble's law more accurate for the objects? closer or further

Explanation:

Let us first calculate for Virgo

Using Hubble's law

For Virgo

Percentage difference for the Virgo

Now for calculate for Corona Borealis

Using Hubble's law

For Corona Borealis

Percentage difference for the Virgo

So clearly  Hubble's law is more accurate for the closer objects

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