Question

a scientist designs an experiment in which a light source is pointed at a substance and a light detector is placed on the opposite side of the substance.
light source
test substance
light detector
when the light source is turned on, the scientist observes that no light is detected on the far side of the substance. what is the best interpretation for this observation?
the light was either absorbed or reflected by the substance.
the light was either reflected or transmitted by the substance.
the light was both reflected and transmitted by the substance.
the light was both absorbed and reflected by the substance.

Explanation:

1. Recall the behavior of light: When light hits a substance, it can be absorbed, reflected, or transmitted.
2. Analyze the observation: No light is detected on the far side, meaning transmission (light passing through) did not occur.
3. Evaluate options:

• Option A: Absorption (light energy taken in) or reflection (light bounces off) would prevent transmission, matching the observation.
• Other options include transmission (which is ruled out by no detection) or incorrect combinations (e.g., both reflected and transmitted would imply some light passes, contradicting no detection). Thus, A is correct.

Answer:

A. The light was either absorbed or reflected by the substance.