Chapt_34 - University Physics (Prof. David Flory) Chapt_34...

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University Physics (Prof. David Flory) Chapt_34 Monday, August 06, 2007 Name: __________________________ Date: _____________ ___ 1. If the magnetic field in a plane electromagnetic wave is along the y axis and its component is given by B max sin ( kx ω t ), in SI units, then the electric field is along the z axis and its component is given by: A) ( cB max ) cos ( kx t ) D) B max cos ( kx t ) B) –( cB max / c ) cos ( kx t ) E) ( cB max / c ) sin ( kx t ) C) –( cB max / c ) sin ( kx t ) ___ 2. Which of the following types of electromagnetic radiation travels at the greatest speed in vacuum? A) Radio waves D) Gamma rays B) Visible light E) All of these travel at the same speed C) X rays ___ 3. The Sun is about 1.5 × 10 11 m away. The time for light to travel this distance is about: A) 4.5 × 10 18 s B) 8 s C) 8 min D) 8 hr E) 8 yr ___ 4. The order of increasing wavelength for blue (b), green (g), red (r), and yellow (y) light is: A) r, y, g, b B) r, g, y, b C) g, y, b, r D) b, g, y, r E) b, y, g, r ___ 5. If the electric field in a plane electromagnetic wave is along the y axis and its component is given by E max sin ( kx + t ), in SI units, then the magnetic field is along the z axis and its component is given by: A) ( E max / c ) cos ( kx + t ) D) E max cos ( kx + t ) B) –( E max / c ) cos ( kx + t ) E) ( E max / c ) sin ( kx + t ) C) –( E max / c ) sin ( kx + t ) ___ 6. A sinusoidal electromagnetic wave with a maximum electric field of 100 V/m is incident normally on a surface with an area of 1 cm 2 and is completely absorbed. The energy absorbed in 10 s is: A) 1.3 mJ B) 13 mJ C) 27 mJ D) 130 mJ E) 270 mJ Write the letter for the correct answer on the answer sheet.
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Chapt_34 - University Physics (Prof. David Flory) Chapt_34...

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