(27) A skater on ice begins to spin in the camel position, as shown in the figure to the left below. As she continues to spin, she straightens up, pulls her arms to her chest, and crosses her legs to spin in the corkscrew position, as shown in the figure to the right below. Air resistance and friction are negligible as the skater spins. Camel Position Corkscrew Position Which of the following statements about the skater's motion is true? (A) Her angular momentum increases when she moves to the corkscrew position because her angular speed increases. (B) Her angular momentum increases when she moves to the corkscrew position because her rotational inertia increases. (C) Her angular momentum remains the same when she moves to the corkscrew position because there is negligible frictional torque. (D) Her angular momentum decreases when she moves to the corkscrew position because her angular speed increases. (E) Her angular momentum decreases when she moves to the corkscrew position because her rotational inertia decreases.

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Students often get confused between Wien's displacement law and Planck's radiation law. Although both are historically related, yet they are conceptually different. Planck's law helps determine the spectrum of a blackbody, while Wien's law determines the relationship between peak wavelength and temperature.