Based on Anya's experiment with four smooth materials under a heat lamp for thirty minutes, which conclusion is best supported?

Based on Anya's experiment with four smooth materials under a heat lamp for thirty minutes, which conclusion is best supported?

• A. Material W is less absorbent than material Z.
• B. Material Y is the least reflective.
• C. Material X is more reflective than material W.
• D. Material Z is the least absorbent.

Answer: (A)

When a surface is exposed to radiant heat, the amount of energy it absorbs shows up as a rise in its temperature. In this experiment, all four smooth materials were exposed to the same heat lamp for the same time, so the material that heats up more has absorbed more energy (higher absorptivity), while the one that heats up less has absorbed less energy (lower absorptivity). If the observed data show that material Z warms more than material W after thirty minutes, then Z has absorbed more energy and is more absorbent than W, meaning material W is less absorbent than material Z. That direct link between temperature rise and energy absorbed makes the conclusion that W is less absorbent than Z the best-supported one. The other statements would require direct measurements of reflectivity or other properties not necessarily determined by the temperature change alone, so they’re not as directly supported by this setup.

When a surface is exposed to radiant heat, the amount of energy it absorbs shows up as a rise in its temperature. In this experiment, all four smooth materials were exposed to the same heat lamp for the same time, so the material that heats up more has absorbed more energy (higher absorptivity), while the one that heats up less has absorbed less energy (lower absorptivity). If the observed data show that material Z warms more than material W after thirty minutes, then Z has absorbed more energy and is more absorbent than W, meaning material W is less absorbent than material Z. That direct link between temperature rise and energy absorbed makes the conclusion that W is less absorbent than Z the best-supported one. The other statements would require direct measurements of reflectivity or other properties not necessarily determined by the temperature change alone, so they’re not as directly supported by this setup.