A 2.0-F capacitor in series with a 2.0-k resistor is connected to a 60-Hz ac source. Calculate the impedance of the circuit.
a. 1 500 ohms
b. 1 800 ohms
c. 2 100 ohms
d. 2 400 ohms
e. 8 600 ohms
[Ques. 2] Twelve hours of daytime and twelve hours of nighttime occur at every location on Earth whenever the Sun reaches the
a. north or south celestial pole.
b. celestial prime meridian.
c. vernal or autumnal equinox.
d. ecliptic.
[Ques. 3] Niels Bohr focused his attention on the element hydrogen because it
a. could be obtained in extremely high purity.
b. was so abundant.
c. had the simplest atom.
d. was inexpensive.
[Ques. 4] At what frequency will a 50.0-mH inductor have a reactance XL = 700?
a. 352 Hz
b. 777 Hz
c. 1.25 kHz
d. 2.23 kHz
e. 14 kHz
[Ques. 5] The half-circle that defines the starting point for designating longitude on the celestial sphere is called the
a. vernal equinox.
b. ecliptic.
c. celestial prime meridian.
d. Greenwich meridian.
[Ques. 6] Discrete wavelengths of light are emitted by an excited gas because
a. the speed of light is constant in a given medium.
b. light can behave either as a wave or as a particle.
c. electron energy levels are quantized.
d. the intensity of radiation is proportional to the second power of the frequency.
[Ques. 7] At what frequency will a 12-F capacitor have a reactance XC = 300?
a. 44 Hz
b. 88 Hz
c. 180 Hz
d. 350 Hz
e. 280 Hz
[Ques. 8] One parsec is defined as the distance to a star when the star exhibits a parallax of what angle of arc?
a. One degree
b. One second
c. One millimeter
d. One minute
[Ques. 9] If the energy of n = 6 is 0.378 eV and that of n = 5 is 0.544 eV in a hydrogen atom, a transition from n = 6 to n = 5 will _______________ a photon with an energy of approximately ______________.
a. absorb; 0.922 eV
b. emit; 0.166 eV
c. absorb; 0.166 eV
d. emit; 0.922 eV
[Ques. 10] Capacitive reactance XC is given by
a. 1/C
b. C
c. /C
d. C/
e. 1/2C
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