Stars are born in ______________________
a. molecular clouds b. atomic hydrogen clouds
c. emission nebula d. reflection nebula
a
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Diffraction Gratings: When red light illuminates a grating with 7000 lines per centimeter, its second maximum is at 62.4°. What is the wavelength of this light?
Fill in the blank(s) with the appropriate word(s).
You measure Cepheid variables in galaxy A and galaxy B. Both Cepheids have the same period, but the one in galaxy B appears 16 times brighter than the other. You conclude
A. Galaxy B is 16 × 16 = 256 times more distant that galaxy A. B. Galaxy A is 16 × 16 = 256 times more distant that galaxy B. C. Galaxy A is 4 times more distant than galaxy B. D. Galaxy B is 4 times more distant than galaxy A. E. Galaxy B is 16 times more distant than galaxy A.
Which experiences the least electrical force in an electric field?
A) alpha particle B) beta particle C) electron D) gamma ray E) all the same
Contrast observation of ionized and neutral hydrogen in space
What will be an ideal response?