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LED Operation and Band Gap Energy Quiz

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Questions and Answers

What is the purpose of the LEDs in a pulse oximeter?

To detect heart rate

To determine blood pressure

To measure blood volume

To estimate blood oxygenation (correct)

In a pulse oximeter, which side of the device emits red and infrared light?

The side with LEDs (correct)

None of the sides emit light

Both sides emit light

The side with the photodiode detector

According to the Beer-Lambert law, what does the '𝐿' represent?

Concentration

Absorption coefficient

Measured light intensity

Path length (correct)

What is the relationship between blood oxygenation estimation and the wavelength of light used in a pulse oximeter?

Direct relationship Signup and view all the answers

When there are multiple absorbers in a pulse oximeter, which formula is used to calculate the intensity of light transmission?

$𝐼 = 𝐼0exp(− 𝛼)* 𝐻𝑏 𝐿 − 𝛼)*+,[𝐻𝑏𝑂,]𝐿 − 𝛼-.//01 [𝑡𝑖𝑠𝑠𝑢𝑒]𝐿)$ Signup and view all the answers

What is the function of the photodiode detector in a pulse oximeter?

To receive transmitted light signals Signup and view all the answers

How does a pulse oximeter estimate blood oxygenation using LED technology?

By measuring light absorption by Hb and HbO2 Signup and view all the answers

What is the significance of the different wavelengths of light (940 nm and 660 nm) used in a pulse oximeter?

They help in measuring light transmission through tissue for blood oxygenation estimation Signup and view all the answers

In semiconductor materials used in LEDs, what does the energy band gap represent?

The energy needed to free an electron for conduction Signup and view all the answers

What impact does pumping of arterial blood have on a pulse oximeter's measurement function?

Leads to variations in transmitted light intensity based on blood volume changes Signup and view all the answers