# How Well Do You Know Photodiode Quiz

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Matt Balanda, BS, Science |
Physics Expert
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Matt graduated with a Master's in Educational Leadership for Faith-Based Schools from California Baptist University and a Bachelor's of Science in Aerospace Engineering and Mathematics from the University of Arizona. A devoted leader, transitioned from Aerospace Engineering to inspire students. As the High School Vice-Principal and a skilled Physics teacher at Calvary Chapel Christian School, his passion is nurturing a love for learning and deepening students' connection with God, fostering a transformative educational journey.
, BS, Science
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How well do you know about photodiodes? Here, we have a quiz based on that. The aim of this photodiode quiz is to provide you with accurate knowledge of the concepts of special diodes. A photodiode is a light-sensitive semiconductor device that follows a P-N junction rule. It converts photons into electrical currents. What else do you know about it? Have you ever worked or used such diodes? Just take the quiz below and improve your understanding of photodiodes.

• 1.

### When a photon of sufficient energy strikes the diode, it excites an electron, thereby creating a free electron. What is this phenomenon called?

• A.

Peltier Effect

• B.

Photoelectric Effect

• C.

Seebeck Effect

• D.

Dipole Effect

B. Photoelectric Effect
Explanation
The correct answer is Photoelectric Effect. This phenomenon refers to the emission of electrons from a material when it is exposed to light or other electromagnetic radiation. When a photon with sufficient energy strikes the diode, it transfers its energy to an electron, causing it to be excited and break free from the material. This effect is the basis for various applications such as solar cells and photoelectric detectors.

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• 2.

### By definition, N-type semiconductor has an excess of  _______ compared to the P-type region, which has an excess of ______ compared to the N-type region.

• A.

Electrons, holes

• B.

Holes, electrons

• C.

Holes, holes

• D.

Electrons, electrons

A. Electrons, holes
Explanation
In a N-type semiconductor, there is an excess of electrons compared to the P-type region, which has an excess of holes compared to the N-type region. This is because in a N-type semiconductor, impurities are added to the crystal lattice, creating extra electrons. On the other hand, in a P-type semiconductor, impurities are added to the crystal lattice, creating extra holes, which are vacancies in the valence band where electrons can move. Therefore, the correct answer is "electrons, holes".

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• 3.

### When a diode is reverse biased, the width of the depletion layer __________, causing the capacitance to _________.

• A.

Increases, increase

• B.

Increases, decrease

• C.

Decreases, increase

• D.

Decreases, decrease

B. Increases, decrease
Explanation
The boundaries of the depletion region act as the plates of a parallel plate capacitor. The junction capacitance is directly proportional to the diffused area and inversely proportional to the width of the depletion region.

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• 4.

### Photodiodes operate by absorption of photons or charged particles and generate a flow of current in an external circuit, _______ to the incident power. The light is absorbed __________ with distance and is _________ to the absorption coefficient.

• A.

Proportional, exponentially, proportional

• B.

Proportional, logarithmically, inversely proportional

• C.

Inversely proportional, exponentially, unrelated

• D.

Inversely proportional, exponentially, proportional

A. Proportional, exponentially, proportional
Explanation
Photodiodes operate by absorbing photons or charged particles, which leads to the generation of a current in an external circuit. This current flow is directly proportional to the incident power of the light. As the light travels through the photodiode, it is absorbed exponentially with distance, meaning that the absorption decreases rapidly as the distance increases. The absorption coefficient, which represents the probability of absorption per unit distance, is directly proportional to the absorption of light. Therefore, the correct answer is "proportional, exponentially, proportional."

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• 5.

### Dark current is

• A.

Produced by forward biasing the photodiode

• B.

Produced by the random generation of electrons and holes in the depletion region

• C.

Produced by incident photons generating electrons and holes in the depletion region

• D.

Produced by reversed biasing the photodiode

B. Produced by the random generation of electrons and holes in the depletion region
Explanation
Dark current refers to the flow of current in a photodiode even when there is no incident light. This current is produced by the random generation of electrons and holes in the depletion region of the photodiode. These electron-hole pairs are generated due to thermal energy, causing a small current to flow. The dark current can affect the accuracy and sensitivity of the photodiode in low light conditions and needs to be minimized for optimal performance.

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• 6.

### The presence of dark current decreases the sensitivity of the photodiode to light.

• A.

True

• B.

False

A. True
Explanation
The presence of dark current in a photodiode refers to the small current that flows through the device even when no light is present. This dark current can limit the sensitivity of the photodiode to detect and measure light accurately. When dark current is present, it adds to the signal being measured, making it more difficult to distinguish between the actual light signal and the noise caused by the dark current. Therefore, the statement that the presence of dark current decreases the sensitivity of the photodiode to light is true.

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• 7.

### When the p–n junction is forward biased,

• A.

The electric charge remains the same as the junction barrier is not affected

• B.

The electric charge flow is restricted due to the increased junction barrier

• C.

The electric charge flows freely due to the decreased junction barrier

• D.

All of these statements are true.

C. The electric charge flows freely due to the decreased junction barrier
Explanation
When the p-n junction is forward biased, the electric charge flows freely due to the decreased junction barrier. In a forward biased p-n junction, the positive terminal of the power supply is connected to the p-side and the negative terminal is connected to the n-side. This causes the depletion region to narrow, reducing the junction barrier. As a result, the electric charge carriers (electrons and holes) can easily cross the junction and flow through the circuit. Therefore, the statement that the electric charge flows freely due to the decreased junction barrier is correct.

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• 8.

### If a diode is reverse biased, the voltage at the anode is higher than at the cathode.

• A.

True

• B.

False

B. False
Explanation
If a diode is reverse biased, the voltage at the cathode is higher than that at the anode.

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• 9.

### Which can be used as a photo detector in Fiber Optic Communication?

• A.

PIN photodiodes

• B.

Tunnel diode

• C.

LED

• D.

LASER diode

A. PIN photodiodes
Explanation
PIN photodiodes can be used as a photo detector in Fiber Optic Communication. Unlike tunnel diodes, LED, and LASER diodes, PIN photodiodes have a structure that allows them to efficiently convert light signals into electrical signals. They have a p-type layer, an intrinsic (undoped) layer, and an n-type layer, which creates a large depletion region. This structure enhances the absorption of light, making PIN photodiodes ideal for detecting optical signals in fiber optic communication systems.

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• 10.

### The light consists of small energy packets called _______ according to The Quantum Theory.

• A.

Neutron

• B.

Krypton

• C.

Photon

• D.

Proton

C. Photon
Explanation
The Quantum Theory states that light is made up of small energy packets called photons. Photons are particles that carry electromagnetic radiation and have no mass. They are responsible for transmitting light and other forms of electromagnetic radiation. Neutrons, krypton, and protons are not related to the concept of light consisting of energy packets according to The Quantum Theory.

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Matt Balanda |BS, Science |
Physics Expert
Matt graduated with a Master's in Educational Leadership for Faith-Based Schools from California Baptist University and a Bachelor's of Science in Aerospace Engineering and Mathematics from the University of Arizona. A devoted leader, transitioned from Aerospace Engineering to inspire students. As the High School Vice-Principal and a skilled Physics teacher at Calvary Chapel Christian School, his passion is nurturing a love for learning and deepening students' connection with God, fostering a transformative educational journey.

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