A Radiometer Has Two Square Vanes (Each Measuring 1

question 37

Multiple Choice

A radiometer has two square vanes (each measuring 1.0 cm by 1.0 cm) , attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure. The center of each vane is 6.0 cm from the axis. One vane is silvered and it reflects all radiant energy incident upon it. The other vane is blackened and it absorbs all incident radiant energy. An electromagnetic wave with an intensity of 0.30 kW/m² is incident normally upon the vanes. What is the electromagnetic power absorbed by the blackened vane? (c = 3.00 × 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

• A) 0.030 W
• B) 0.040 W
• C) 0.050 W
• D) 0.060 W
• E) 0.090 W

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Definitions:

Benevolent Beliefs

Positive but patronizing beliefs and attitudes that can unintentionally perpetuate inequality, often viewed as harmless or even supportive by those who hold them.

Justification Suppression Model

The idea that people endorse and freely express stereotypes in part to justify their own negative affective reactions to outgroup members.

Stereotype Threat Hypothesis

The stereotype threat hypothesis proposes that individuals at risk of confirming negative stereotypes about their social group may underperform in relevant tasks due to increased stress and anxiety.

System Justification Hypothesis

A theory suggesting that people have a psychological inclination to defend and justify the existing social, economic, and political systems, even at a cost to personal and group interest.