Chapt_38

# Chapt_38 - University Physics(Prof David Flory Chapt_38...

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University Physics (Prof. David Flory) Chapt_38 Monday, August 06, 2007 Name: __________________________ Date: _____________ ___ 1. Two electrons move in opposite directions at 0.70 c as measured in the laboratory. The speed of one electron as measured from the other is: A) 0.35 c B) 0.70 c C) 0.94 c D) 1.00 c E) 1.40 c ___ 2. Visible light, with a frequency of 6.0 × 10 14 Hz, is reflected from a spaceship moving directly away at a speed of 0.90 c . The frequency of the reflected waves observed at the source is: ___ 3. Two events occur 100 m apart with an intervening time interval of 0.60 μ s. The speed of a reference frame in which they occur at the same coordinate is: ___ 4. An electron ( m = 9.11 × 10 –31 kg) has a momentum of 4.0 × 10 –22 kg · m/s. Its kinetic energy is: ___ 5. The velocity of an electron is changed from c /2 in the – x direction to c /2 in the + x direction. As a result, its kinetic energy changes by: A) mc 2 B) 0.5 mc 2 C) 2 2 mc D) 2 mc 2 E) zero ___ 6. An electron ( m = 9.11 × 10 –31 kg) has a speed of 0.95 c . Its kinetic energy is: Write the letter for the correct answer on the answer sheet. Write clearly. Page 1

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