1.

The reflected light from the skin at wavelengths of 665nm(red) and 935nm(infrared) is detected by ______________

A. Photo diode
B. Laser diode
C. Silicon diode
D. and 935nm(infrared) is detected by ______________a) Photo diodeb) Laser diodec) Silicon dioded) Zener diode
Answer» D. and 935nm(infrared) is detected by ______________a) Photo diodeb) Laser diodec) Silicon dioded) Zener diode


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