6.02 × 10^23 is known as ______________
Fill in the blank(s) with correct word
Avogadro's number
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The human eye can just detect green light of wavelength 500 nm if it arrives at the retina at the rate of 2 × 10-18 W. How many photons arrive each second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
What will be an ideal response?
If a star system 30 parsecs distant is found to be broadcasting intelligent radio signals, then their news is already approximately ________ years old
A) 10 B) 30 C) 100 D) 300 E) 1,000
A design requires a material that must have a high melting temperature, high stiffness, high compressive strength, low density, and low cost. Which of the following materials is most likely to best satisfy the design requirements?
(a) Alumina ceramic (b) Carbon steel (c) Polyethylene (d) Graphite-reinforced-epoxy composite
The orbital angular momentum quantum number can take which of the following values for any given value of the principal quantum number, n?
A) ? = 0, 1, 2, . . . B) ? = 0, 1, 2, . . . , n C) ? = 0, 1, 2, . . . , (n - 1) D) ? = 1, 2, 3, 4, . . . E) ? = 1, 2, 3, 4, . . ., (n + 1)