Is it true that the television screen is a light source?

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True

False

answer is A.

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Detailed Solution

The above statement is True.
Anything that produces light, whether artificial or natural, is referred to as a light source. The Sun and stars are examples of sources of natural light. Lampposts and televisions are examples of artificial lighting sources. Of course, we would not be able to see our surroundings without light sources, but not all things we can see are light sources. For example, instead of a beam of electrons striking the screen, you excite a portion of the gas mixture within each pixel, causing it to emit ultraviolet photons (radiation that is invisible to the human eye), which in turn excite the phosphor pixel and cause it to emit visible light (where our eyes can see).

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