Of the following list, the one that gives the smallest average ionizing radiation dose per person per year is
A) nuclear power plants in normal operation.
B) cosmic rays.
C) the rocks and soil of Earth.
D) radon gas.
E) medical X-rays.
A
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____ shows that the building blocks of life form naturally under a wide range of circumstances
a. The Miller experiment b. The Chicxulub event c. The earliest fossils d. The Drake equation e. Stromatolites
The luminosity (L) of a star is the total energy the star radiates in _______________
Fill in the blank(s) with correct word
A laser emits light of wavelength 463 nm during a brief pulse that lasts for 25 ms and has a total energy of 1.2 J. How many photons are emitted in that single pulse? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 2.8 × 1018 B) 6.9 × 1019 C) 3.4 × 1019 D) 1.1 × 1017 E) 2.2 × 1017
Energy Levels: The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states for the transition that produces this light? (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 1.54 eV B. 1.65 eV C. 1.79 eV D. 1.81 eV