Under which circumstances can you be sure that the thermal pressure within a gas cloud is increasing?
A) The cloud's temperature and density are both increasing.
B) The cloud's temperature is increasing and its density is decreasing.
C) The cloud's temperature and density are both decreasing.
D) The cloud's temperature is decreasing and its density is increasing.
E) impossible to say
A) The cloud's temperature and density are both increasing.
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When the microwave background radiation was emitted, about how big was the universe?
A) smaller than the head of a pin B) 1/1,000,000 its current size C) 1/100,000 its current size D) 1/1,000 its currents size E) 1/100 its current size
A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV. What is the threshold frequency for photoelectron production? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 7.6 × 1014 Hz B) 8.5 × 1014 Hz C) 2.7 × 1014 Hz D) 9.4 × 1014 Hz E) 6.8 × 1014 Hz
Characteristic x-ray spectra come from
Why are type O, A, and M stars considered poor candidates to find a technological civilization?
What will be an ideal response?