Two sources emit beams of light of wavelength 550 nm. the light from source a has an intensity of 10 µw/m2, and the light from source b has an intensity of 20 µw/m2. this is all we know about the two beams. which of the following statements about these beams are correct? (there could be more than one correct choice.)a) a photon in beam b has twice the energy of a photon in beam a. b) a photon in beam b has the same energy as a photon in beam a. c) beam b carries twice as many photons per second as beam a. d) the frequency of the light in beam b is twice as great as the frequency of the light in beam a. e) none of the above statements are true.

increases it

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

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.