University Physics (Prof. David Flory) Chapt_38 Monday, August 06, 2007Name: __________________________ Date: ________________ 1.Two electrons move in opposite directions at 0.70cas measured in the laboratory. The speed of one electron as measured from the other is:A)0.35cB)0.70cC)0.94cD)1.00cE)1.40c___ 2.Visible light, with a frequency of 6.0 ×1014Hz, is reflected from a spaceship moving directly away at a speed of 0.90c. 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 μs. The speed of a reference frame in which they occur at the same coordinate is:___ 4.An electron (m= 9.11 ×10–31kg) has a momentum of 4.0 ×10–22kg · m/s. Its kinetic energy is:___ 5.The velocity of an electron is changed from c/2 in the –xdirection to c/2 in the + xdirection. As a result, its kinetic energy changes by:A)mc2B)0.5mc2C)22mcD)2mc2E)zero___ 6.An electron (m= 9.11 ×10–31kg) has a speed of 0.95c. Its kinetic energy is:Write the letter for the correct answer on the answer sheet. Write clearly. Page 1
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