Inferring cloud properties using carbon-monoxide: At the low temperatures of molecular clouds, carbon monoxide emits radio light more strongly than does molecular hydrogen
What assumptions must be made to then use observations of carbon monoxide to infer the properties of the cloud as a whole?
The hydrogen-to-CO ratio must be assumed, as well as assuming that the two molecules are well mixed.
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Astronomers have defined a(n) _______________ around a star as a region within which planets that orbit there have temperatures permitting the existence of liquid water
Fill in the blank(s) with correct word
In 1974, astronomers sent an anticoded message as a string of 1679 _______________ and _______________
Fill in the blank(s) with correct word
Diffraction Gratings: A 17-mm-wide diffraction grating has rulings of 530 lines per millimeter. White light is incident normally on the grating. What is the longest wavelength that forms an intensity maximum in the fifth order?
A. 377 nm B. 352 nm C. 402 nm D. 427 nm E. 452 nm
Even a little first-grader can stay up on a bicycle if he can get his bicycle moving fast enough because
A. the first-grader's weight causes a torque too small to make the bicycle fall sideways when moving. B. the angular momentum of the wheels wants to stay horizontal, due to conservation of angular momentum. C. pedaling faster is easier once you are stable, and more pedaling increases net angular momentum. D. All of these choices are correct