By what amount does the sound intensity decrease when the distance to the source triples?
a. 9.0 dB
c. 6.0 dB
b. 9.5 dB
d. 3.5 dB
B
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A coating is being applied to reduce the reflectivity of a pane of glass to light with a frequency of 5.75 × 1014 Hz that is incident normally on the pane
If the material has an index of refraction of 1.375 and the glass has an index of refraction of 1.537, what is the minimum thickness the coating should have? (c = 3.00 × 108 m/s) A) 60.0 nm B) 94.9 nm C) 145 nm D) 65.2 nm E) 80.1 nm
A 25.0-V potential source (a battery) is connected across the plates of a 6.66-µF air-filled parallel-plate capacitor having plates that are 1.22 mm apart. What energy density does it produce between the plates? (?0 = 8.85 × 10-12 C2/N ? m2)
What will be an ideal response?
A car starting from rest travels a distance of 20.0 m with a constant acceleration of 2.0 
The car then slows to a stop in 10.0 seconds with a constant negative acceleration. The distance traveled by the car is
A. 36 m. B. 46 m. C. 50 m. D. 58 m. E. 65 m.
Rank these times based on the wavelength of the peak intensity of the cosmic background radiation at those times, from shortest to longest. (Hint: consider how the temperature of the universe or the cosmic background radiation changed with time.)
A) today, 1 million years after the Big Bang, 100 million years after the Big Bang B) 100 million years after the Big Bang, 1 million years after the Big Bang, today C) today, 100 million years after the Big Bang, 1 million years after the Big Bang D) 1 million years after the Big Bang, 100 million years after the Big Bang, today