Signal world perspective: “The real world is mainly analog.” Assess this statement in the context of sensors, physical phenomena, and data acquisition.

Introduction / Context:
Most physical quantities (temperature, sound, light intensity, position, pressure) vary continuously. Digital electronics sample and quantize these analog phenomena to process and store them efficiently. The statement evaluates this analog predominance.

Given Data / Assumptions:

• Physical signals vary on a continuum.
• Digital systems require sampling and quantization via ADCs.
• Sensors (microphones, thermistors, strain gauges) produce analog outputs before digitization.

Concept / Approach:
Analog describes continuous-time, continuous-amplitude signals. Digital abstracts these into discrete values at discrete times. The pervasiveness of analog sources means digital systems almost always include front-end analog conditioning and conversion stages.

Step-by-Step Solution:

Verification / Alternative check:
Observe any data acquisition chain: analog sensor → amplifier/anti-alias filter → ADC → processor. This universal pattern confirms the statement.

Why Other Options Are Wrong:

Common Pitfalls:
Assuming “digital equals more accurate.” Accuracy depends on the entire chain (noise, bandwidth, resolution), not the mere use of digital representation.

Final Answer:
Correct