Question

Input phosphor size varies from ____?

1) 0.1 mm to 0.5 mm
2) 0.5 mm to 1 mm
3) 1 mm to 2 mm
4) 2 mm to 5 mm

Answer 1

The input phosphor size varies most likely from 0.5 mm to 1 mm, based on intermediate sizing considerations to prevent excessive area or thinness for desired energetics and depth without UV/IR spill-over.

Correct option is 2) 0.5 mm to 1 mm

Step-by-step explanation:

The size range for input phosphor typically varies depending on the system in question. However, based on the given statements, we can infer that if making the size 0.5 µm wide seems too thin, and 1.0 µm seems too much, a size in between would be more appropriate. Hence, we can postulate that the correct range might be closer to 0.5 mm to 1 mm, accounting for the energetics and depth of penetration required without causing spill-over into ultraviolet (UV) and/or infrared (IR) regions.

This seems to be somewhat supported by the statement, 'If we make it 0.5 µm wide, it seems too thin: the area is smaller than what's under the blue curve. 1.0 µm wide seems like too much area. So we pick something in the middle like 0.75 um (Figure 13.2).' Bearing in mind that the figures or equations referred to are not provided here, this is the best estimate that correlates with the information provided.