The cores of the terrestrial worlds are made mostly of metal because
A) the terrestrial worlds as a whole are made mostly of metal.
B) metals sunk to the centers a long time ago when the interiors were molten throughout.
C) the core contained lots of radioactive elements that decayed into metals.
D) over billions of years, convection gradually brought dense metals downward to the core.
B
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Matter Waves: 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?
Fill in the blank(s) with the appropriate word(s).
A star's spectral type can be used to determine its
A) mass. B) surface temperature. C) luminosity. D) core temperature. E) radius.
Approximately how massive is the Sun as compared to Earth?
A. 300 times B. 3,000 times C. one million times D. 300,000 times E. 100 times
A bimetallic strip is usable as a thermometer because of
a. heat conduction. b. heat convection. c. heat radiation. d. thermal expansion. e. none of the above.