The key ingredient in planetary formation in the solar nebula is ________
Fill in the blank(s) with correct word
interstellar dust or dust grains
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A charged particle with mass m is suspended in the air by an upward-directed electric field E. What is the charge on the dust particle?
a. q = mgE b. q = mg/E c. q = E/mg d. q = Em/g
Find the frequency of x-rays of wavelength 1.75 × 10^?10 m. (c = 3 × 10^8 m/s)
a. 1.71E+12 Hz b. 3.43E+19 Hz c. 1.71E+18 Hz d. 3.43E+9 Hz e. 4.29E+14 Hz
When an electron and a positron meet and annihilate, the mass-energy of the particles is carried away by
A) a gamma ray. B) two gamma rays, otherwise momentum wouldn't be conserved. C) nothing at all, gone.
Wine made from fossil fuels is not radioactive because
A. the radioactivity has decayed away B. there is no carbon in such wine C. ancient plants never were radioactive D. the half-life of the key elements is too long