If two electrons in the same atom have the same four quantum numbers, then they must have the same energy. a. trueb. falsec. they cannot both have the same four quantum numbers.

To solve this question, we will rely on the Pauli exclusion principle, which warns that from quantum mechanics two or more identical fermions (particles with spin of the whole medium) cannot occupy the same quantum state within a quantum system simultaneously. Therefore, when two electrons have the same n, l and ml, then they are in the same orbital. But they can't have the same energy. Hence, the energy is different.

Therefore the correct answer is B. False.

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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