A Radiometer Has Two Square Vanes (Each Measuring 1

question 36

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:

Suicide Rates

The proportion of individuals within a given population who die by suicide over a specific period.

Social Change

signifies the transformation over time of cultural values, norms, institutions, and structures within a society.

Suicide Threateners

Individuals who express an intention to end their own life, often as a cry for help or as an expression of extreme distress.

Suicide Attempters

Individuals who have attempted to take their own life.