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?
5
Physics & Space Science
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There are 2.00 dry pints to 1.00 dry quart, 8.00 dry quarts to 1.00 peck, 4.00 pecks to 1.00 bushel. An organic farmer wants to pick enough berries to fill 40,000 pint containers. How many bushels of berries does the farmer need?
What will be an ideal response?
Physics & Space Science
Tripling the tension in a guitar string will change its natural frequency by what factor?
a. 3 c. 3–1/2 b. 31/2 d. 1.5
Physics & Space Science
A toy elevator is raised from the ground floor to the second floor in 20 seconds. The power needed using 1000 J of work, is
A) 20 W. B) 50 W. C) 100 W. D) 1000 W. E) 20,000 W.
Physics & Space Science
In an energy level transition from the n = 2 state to the n = 1 state for a hydrogen atom a photon will be ___________
Fill in the blank(s) with correct word
Physics & Space Science