Resolution: Even with perfect optics, what is the resolution limit (in radians) of the Hubble Space Telescope when it is focusing light of wavelength 400 nm? The mirror diameter is 2.4 m.
Fill in the blank(s) with the appropriate word(s).
2.0 × 10-7 rad
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Observing star clusters will give astronomers needed data for stellar evolution because all the stars in the cluster have the same ____
a. masses b. temperatures c. ages d. luminosities e. apparent magnitudes
Which of the following demonstrates the indeterminacy inherent in the microscopic [or atomic-level] world?
A) double slit experiment with electrons B) radioactive decay C) Both of the above. D) spontaneous creation of a positron-electron pair from a photon E) All of the above.
Electric Field of Point-Charges: A +5.00-?C point charge is placed at the 0.0 cm mark of a meter stick and a -4.00-?C point charge is placed at the 50.0 cm mark. At what point on a line through the ends of the meter stick is the electric field equal to zero?
A. 1.4 m from the 0 cm mark B. 2.5 m from the 0 cm mark C. 2.9 m from the 0 cm mark D. 3.3 m from the 0 cm mark E. 4.7 m from the 0 cm mark
When you send a wave pulse down a rope or Slinky, it eventually dies out. What has become of the energy?
A) It was transformed into electromagnetic energy. B) It was transformed into Italian sausage. C) It was transformed into thermal energy. D) It was transformed into elastic energy. E) It vanished because energy is always lost in all physical processes.