If the sound level increases by 20 decibels, by about how much has the intensity of sound (in W/m2) increased?
A. 2 times
B. 10 times
C. 20 times
D. 100 times
E. 200 times
F. Some other factor (specify)
D. 100 times
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The expansion of the Universe is accelerating
a. True b. False Indicate whether the statement is true or false
Vision Problems: Mahmood is farsighted and cannot see objects clearly that are closer to his eye than 80.0 cm. What is the focal length of the contact lenses that will enable him to comfortably see objects at a distance of 25.0 cm from his eyes?
A. +36.4 cm B. -36.4 cm C. -21.2 cm D. +21.2 cm E. +32.5 cm
The primary source of energy for a star as it grows in size to become a red giant is
A) hydrogen fusion in the central core. B) helium fusion in the central core. C) hydrogen fusion in a shell surrounding the central core. D) gravitational contraction.
What is the wavelength of the line in the Paschen series of hydrogen that is comprised of transitions from the n = 5 to the n = 3 levels? (R = 1.097 × 10^7 m?1 and 1 nm = 10?9 m)
a. 1406 nm b. 1282 nm c. 684 nm d. 750 nm e. 365 nm