Final answer:
Perception-Based Unit Obstacles refer to obstacles that affect the ability of individuals to perceive, detect or measure certain units of physical quantities accurately.
Step-by-step explanation:
Perception-Based Unit Obstacles refer to obstacles that affect the ability of individuals to perceive, detect or measure certain units of physical quantities accurately. These obstacles are often associated with limitations in human perception and can lead to errors in measurements.
For example, in physics, one of the perceptual-based obstacles is parallax error. This occurs when the position of the eye affects the reading of a scale or the alignment of an object. Another example is instrumental limitations, where the accuracy of the measuring instrument itself affects the precision of the measurement.
Understanding and accounting for perception-based unit obstacles is crucial in physics experiments and measurements to ensure accurate and reliable results.