Opto-electronic devices – Match each device to its defining behavior List I (Device) A. Laser B. Solar cell C. Photodiode D. LED List II (Behavior) Emits monochromatic light of low intensity Consumes electrical power due to incident light (reverse-biased detector operation) Delivers power to a load (photo-voltaic mode) Emits monochromatic light of high intensity Select the correct mapping.

Introduction / Context:
Opto-electronic components are categorized by whether they generate light, detect light, or convert light directly into electrical power. Matching these devices with their hallmark behaviors is essential for selecting parts in communication links, sensing, and illumination.

Given Data / Assumptions:

• Laser produces coherent, narrow-spectrum (monochromatic) light with high intensity.
• Solar cell operates in photovoltaic mode, delivering power to a load from incident light.
• Photodiode, when reverse-biased, acts as a light detector drawing current (consuming electrical power) proportional to illumination.
• LED emits light of relatively low intensity and broader spectrum compared to lasers.

Concept / Approach:

Identify each device’s “signature” role: high-intensity monochromatic emission → laser; power generation → solar cell; photo-detection with bias power → photodiode; low-intensity emission → LED. While photodiodes can also operate in photovoltaic mode, the most common detection mode in receivers is reverse-biased (photoconductive), matching the statement given.

Step-by-Step Solution:

Verification / Alternative check:

Check typical link budgets: lasers drive fiber optics; LEDs for indicators/illumination; photodiodes in reverse-bias mode for receivers; solar cells power calculators/satellites from light alone.

Why Other Options Are Wrong:

Mapping “power delivery” to LED or photodiode conflicts with their detector/emitter roles. Assigning “high intensity” to LED ignores the coherent power density of lasers.

Common Pitfalls:

Confusing photodiode photovoltaic vs. photoconductive modes; equating laser and LED because both emit light—only lasers are coherent and typically far higher intensity.

Final Answer:

A-4, B-3, C-2, D-1.