The discovery of ________ at Bell Labs strongly supported the Big Bang
A) pulsars
B) the cosmic microwave background radiation
C) acoustic waves in the early universe
D) the first generation of stars
E) the Hubble law
B
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Which best describes the surface of Triton?
a. old, dark and cratered with a younger surface marked by ovoids b. dark, dirty ice heavily pocked with craters c. an icy crust free of craters with a liquid water ocean beneath it d. an icy surface dominated by frozen nitrogen, methane, carbon monoxide and carbon dioxide e. an icy surface dominated by frozen methane with a liquid ocean beneath it
Galileo's observation of the satellites of Jupiter showed that ________.
A. the Moon was not a flawless sphere B. nothing orbited Earth C. there were objects that did not orbit Earth D. planets orbited the Sun E. None of these choices is correct.
A nonrelativistic electron is accelerated from rest through a potential difference. After acceleration the electron has a de Broglie wavelength of 880 nm
What is the potential difference though which this electron was accelerated? (h = 6.626 × 10-34 J ? s, e = -1.60 × 10-19 C, mel = 9.11 × 10-31 kg) A) 1.9 µV B) 1.7 µV C) 2.2 µV D) 2.5 µV
The oldest rocks found on the Earth's surface date back about ________ billion years
A) one B) two C) three D) four E) four and a half