A handheld remote control for a home entertainment system uses an LED that emits radiation with a peak wavelength of 930 nm. During quality-control testing, engineers also examine a second prototype LED that emits radiation of 650 nm.
The following fundamental constants may be used if needed:
• Speed of light in vacuum: c=3.00×108ms−1
• Planck constant: h=6.626×10−34Js
(a) Describe, without performing any numerical calculations, two reasons why the radiation from the 930 nm LED is classified in a different spectral region than the radiation from the 650 nm LED.
(b) Identify the spectral region (e.g., ultraviolet, visible, infrared, microwave) to which each LED’s peak emission belongs, and justify each choice qualitatively.
(c) Explain how the relative energies of individual photons emitted by the two LEDs support your classifications from part (b).