Final answer:
Humans can see up to 18.4 million pixels on a TV, so it is likely they can distinguish individual pixels on a plasma TV with 3 million pixels if the pixels are large enough and the pixel density is low enough.
Step-by-step explanation:
The question is whether humans can distinguish pixels on a plasma TV with 3 x 106 pixels, compared to being able to see up to 18,400,000 pixels on a typical TV display. In flat screen LCD televisions, light travels from the back through millions of tiny units called pixels. Each pixel contains three cells with red, green, or blue filters, which can be controlled independently to vary picture contrast.
Considering that humans are capable of distinguishing up to 18,400,000 pixels, a plasma TV with only 3 million pixels would likely have larger individual pixels, making it possible for humans to distinguish them, especially if the pixel density is low enough for the pixels to be visible to the n_aked eye at a typical viewing distance.