Stars are born in ______________________

a. molecular clouds b. atomic hydrogen clouds
c. emission nebula d. reflection nebula


a

Physics & Space Science

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Contrast observation of ionized and neutral hydrogen in space

What will be an ideal response?

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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).

Physics & Space Science

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.

Physics & Space Science

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

Physics & Space Science