Answer: the answer is B hopes this helps
Answer:
visible light (wavelength between 0.4 and 0.8 micrometre)
ultraviolet light (wavelength shorter than 0.4 micrometre)
infrared radiation (wavelengths longer than 0.8 micrometre)
Matthew is employing <u>"participant observation"</u>.
Participant observation is one sort of information collection strategy regularly utilized in subjective research. It is a broadly utilized system in numerous disciplines. Its point is to pick up a close commonality with a given gathering of people and their practices through a serious inclusion with individuals in their social condition, for the most part over a broadened time frame.