You have been taken to the emergency room. To get a constant update on your vital signs, equipment is attached to you, including a pulse oximeter. The pulse oximeter shines two LEDs on your finger to test how much oxygen is in your blood. One LED transmits in infrared (920 nm) and one transmits in visible red (656 nm). What are the frequencies of these LEDs?

Explanation:

Given:

λ1 = 920 nm

= 9.2 × 10^-7 m

λ2 = 656 nm

= 6.56 × 10^-7 m

c = 3 × 10^8 m/s

Wavelength, λ = velocity, c/frequency, f

Frequency, f1 = 3 × 10^8/9.2 × 10^-7

= 3.26 × 10^14 Hz

Frequency of the infra red = = 3.26 × 10^14 Hz

Frequency, f2 = 3 × 10^8/6.56 × 10^-7

= 4.57 × 10^14 Hz

Frequency of the visible light = 4.57 × 10^14 Hz

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