Which of the following best describes why the sun emits most of its energy in the form of visible light?
(a) like all objects, the sun emits thermal radiation with a spectrum that depends on its temperature, and the sun's surface temperature is just right for emitting mostly visible light. (b) nuclear fusion in the sun's core produces visible light photons. (c)the sun's gas is on fire like flames from wood or coal, and these flames emit visible light. (d) the visible light comes from energy level transitions as electrons in the sun's hydrogen atoms jump between level 1 and level 2.

(A) Like all objects, the Sun emits thermal radiation with a spectrum that depends on its temperature, and the Sun's surface temperature is just right for emitting mostly visible light.

Explanation:

The temperature of an object is a direct measurement of the energy of motion that absorbs all of the radiation that it receives (that is, it does not reflect any light, nor but many objects (stars included) behave approximately like blackbodies. Therefore, based on the location or the composition of the object, such as the Sun,  it emits a spectrum of visible light

(A) Like all objects, the Sun emits thermal radiation with a spectrum that depends on its temperature, and the Sun's surface temperature is just right for emitting mostly visible light.

Explanation:

The peak wavelength emitted by a body depends on it temperature. The temperature of the surface of the sun is about 5800 K which corresponds to visible wavelength according to Wein's displacement law.

The sun has different temperature in its different parts. It emits radiations in mostly UV, visible and infrared.

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

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