Light with wavelength 5.6 × 10^–7 is used to determine the position of an electron to within the wavelength of the light. What is the resulting uncertainty in the electron's velocity? h = 6.63 × 10^–34 J?s, me = 9.11 × 10^–31 kg
a. 1300 m/s
b. 103 m/s
c. 207 m/s
d. 16,331 m/s
b
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Double-Slit Interference: Coherent light of wavelength 575 nm falls on a double-slit and the third-order bright fringe is seen at an angle of 6.5° away from the centerline. How far apart are the double slits?
A. 5.0 ?m B. 10 ?m C. 15 ?m D. 20 ?m
Which of the following is true about how the planets revolve around the Sun and how the Sun rotates?
a. There is no pattern to the rotation of all these bodies. b. The planets all revolve in one direction and the Sun rotates on its axis in the other direction. c. The planets revolve around the Sun in the same direction that the Sun rotates. d. The Sun rotates on its axis in the opposite direction from the revolution of the planets and thus angular momentum is conserved. e. The Sun does not rotate, but the planets all revolve around it in the same direction.
A star with the mass of our Sun will go through several stages of energy generation through fusion. Which sequence accurately describes these stages in the correct order?
a. hydrogen core ? hydrogen shell ? helium shell ? helium core b. hydrogen core ? helium core ? hydrogen shell ? helium shell c. hydrogen core ? hydrogen shell ? helium core ? helium shell ? carbon core d. hydrogen core ? hydrogen shell ? helium core ? helium shell e. hydrogen shell ? hydrogen core ? helium shell ? helium core
The star nearest the North Celestial Pole is ________.
A. Thuban B. Vega C. Denebola D. Polaris E. Mizar