19. If an electron has a de Broglie wavelength of 2.40 pm (that is, 2.40× m), what is its kinetic energy (J)? This is a relativistic situation. Electron rest energy = 0.511 MeV. (A) (B) (C) (D) (E)

7. The figure shows a book-like object rotating around a perpendicular rotation axis through the given point along the center line that is drawn in dashes. The mass is 2.00 kg. The dimensions are a = 0.010 m, b = 0.020 m, and c = 0.0040 m. What is the rotational inertia (kg-m²)? The rotational inertia about a perpendicular axis through the center of mass is given by I =(a² + b²). (A) (B) (C)(D) (E)

19. If an electron has a de Broglie wavelength of 2.40 pm (that is, 2.40× m), what is its kinetic energy (J)? This is a relativistic situation. Electron rest energy = 0.511 MeV. (A) (B) (C) (D) (E)

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