Find the frequency of X-rays of wavelength 2 × 10^-11 m. (c = 3 × 10^8 m/s)
a. 3 × 10^8 Hz
c. 3 × 10^18 Hz
b. 1.5 × 10^19 Hz
d. 6 × 10^9 Hz
B
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Who first calibrated the Cepheid variable stars for use in determining distance?
a. Henrietta Leavitt b. Edwin Hubble c. John Glenn d. Carl Sagan e. Harlow Shapley
Thermodynamic Devices: An ideal Carnot refrigerator powered from an electrical outlet takes heat from water at 0.0°C and rejects heat to a room at 20.0°C. How much electrical energy must be supplied to the refrigerator so it will convert 78 g of water at 0.0°C to ice at 0.0°C. The latent heat of fusion of water is 3.34 × 105 J/kg.
Fill in the blank(s) with the appropriate word(s).
Most active galactic nuclei are found at large distances from us, with relatively few nearby. What does this imply?
A) Active galactic nuclei exist tend to become less active as they age. B) Supermassive black holes existed only when the universe was young, and no longer exist today. C) Active galactic nuclei can form only at large distances from the Milky Way. D) The jets seen in many active galactic nuclei must cause them to move far away from us.
A single slit illuminated with a 500 nm light gives a diffraction pattern on a far screen. The 5th minimum occurs at 7.00° away from the central maximum. At what angle does the 18th minimum occur?
A) 26.0° B) 1.94° C) 5.05° D) 0.44°