The Virgo Cluster of galaxies is smaller than the Local Group
Indicate whether the statement is true or false
FALSE
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Star may appear fainter due to the interstellar medium. This effect is known as ____________________
a. interstellar reddening b. interstellar extinction c. interstellar absorption line d. interstellar dust
Where do stars form and why?
A) Stars form around giant planets because planets provide the "seeds" of star formation. B) Stars form in cold gas clouds because gravity has to be stronger than gas pressure. C) Stars form in warm dust clouds because the dust shields the protostars from radiation. D) Stars form in hot gas clouds because stars have to be hot to start fusion reactions.
One kilogram of chilled water (0°C) is placed in a freezer which is kept at 0°F (?18°C). Approximately how much electric energy (in kilocalories) is needed just to freeze the water if the room temperature is maintained at 75°F (24°C)? (LF,ice = 333 J/g; cice = 2.09 J/g/°C.)
a. 11 b. 15 c. 16 d. 13 e. 33
A crystal diffracts a beam of electrons, like a diffraction grating, as they hit it perpendicular to its surface. The crystal spacing is 0.18 nm, and the first maximum scattering occurs at 80° relative to the normal to the surface
(e = 1.60 × 10-19 C, melectron = 9.11 × 10-13 kg, h = 6.626 × 10-34 J ? s) (a) What is the wavelength of the electrons? (b) What potential difference accelerated the electrons if they started from rest?