The highest frequency in visible light is associated with the color
A. red.
B. orange.
C. green.
D. blue.
E. violet.
E. violet.
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Impedance: What resistance is needed in a series circuit with a 20-mH coil and 1.0-?F capacitor for a total impedance of 100 ? at 1.5 kHz?
A. 0.16 k? B. 82 ? C. 57 ? D. 18 ?
In the afternoon, the decibel level of a busy freeway is 80 dB with 100 cars passing a given point every minute. Late at night, the traffic flow is only 8 cars per minute. What is the late-night decibel level?
a. 77 dB c. 70 dB b. 74 dB d. 69 dB
The conversion of solar radiation into chemical energy by plants that releases oxygen is called
A) plant succession. B) photosynthesis. C) dendrochronology. D) deforestation. E) podzolization.
Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?
A) The star is a member of a binary star system. B) The star is of spectral type G. C) The star is of spectral type A. D) We know the star's luminosity and distance.