All Lyman emission lines are transitions from the excited state to ________ state
Fill in the blank(s) with correct word
ground
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Possible equations (choose the correct one): ? =10^12/H; H=v/d. If gravity is unimportant and H equals 75 km/s/Mpc, then the age of the universe is about
a. 8.9 billion years. b. 13 billion years. c. 16.6 billion years. d. 26 billion years. e. 74 billion years.
A child pulls on a wagon with a horizontal force of 75 N. If the wagon moves horizontally a total of 42 m in 3.0 min, what is the average power generated by the child?
A) 18 W B) 22 W C) 24 W D) 27 W
A camera uses a
a. converging lens to form a real image. b. converging lens to form an imaginary image. c. diverging lens to form a real image. d. diverging lens to form an imaginary image.
When waves from a pair of closely-spaced slits arrive out of phase
A) a bright fringe is produced. B) a dark fringe is produced. C) both bright and dark fringes are produced. D) none of the above