A Radiometer Has Two Square Vanes $( 1.0 \mathrm {~cm}$ By $1.0 \mathrm {~cm} )$

question 36

Multiple Choice

A radiometer has two square vanes $( 1.0 \mathrm {~cm}$ by $1.0 \mathrm {~cm} )$ , 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 $6.0 \mathrm {~cm}$ 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. Radiant energy, having an intensity of $300 \mathrm {~W} / \mathrm { m } ^ { 2 }$ , is incident normally upon the vanes. What is the radiation pressure on the blackened vane? $\left( c = 3.0 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , \mu _ { 0 } = 4 \pi \times 10 ^ { - 7 } \mathrm {~T} \cdot \mathrm { m } / \mathrm { A } , \varepsilon _ { 0 } = 8.85 \times 10 ^ { - 12 } \mathrm { C } ^ { 2 } / \mathrm { N } \cdot \mathrm { m } ^ { 2 } \right)$

• A) \(1.0 \times 10 ^ { - 10 } \mathrm {~Pa}\)
• B) \(1.0 \times 10 ^ { - 7 } \mathrm {~Pa}\)
• C) \(1.0 \times 10 ^ { - 8 } \mathrm {~Pa}\)
• D) \(1.0 \times 10 ^ { - 6 } \mathrm {~Pa}\)
• E) \(1.0 \times 10 ^ { - 9 } \mathrm {~Pa}\)

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Definitions:

Qualitative Designs

Research methodologies that focus on gathering non-numerical data to understand concepts, perceptions, or experiences.

Quantitative Approaches

Research methods focusing on the collection and analysis of numerical data to understand patterns, relationships, and causality.

Rich Descriptions

Detailed, nuanced accounts of phenomena, typically in qualitative research, that aim to capture the complexity and context of the subject matter.

Experimental Control

The practice of eliminating or managing variables that can affect the outcome of an experiment, except for the variable being studied.