Which of the following provides the longest cable run distance?
A. Single-mode fiber.
B. multi-mode fiber.
C. category 3 UTP
D. Coax.
Answer: A. Single-mode fiber.
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The star Vega has an absolute magnitude of about 4 and an apparent magnitude of about 0. Based on the definitions of absolute and apparent magnitude, we can conclude that ________
A) Vega's surface temperature is cooler than the Sun B) Vega is nearer than 10 parsecs from Earth C) Vega's luminosity is less than that of our Sun D) Vega has a parallax angle of 1/10 arcsecond
The statement by Newton that "for every action there is an opposite but equal reaction" is regarded as which of his laws of motion?
a. first b. second c. third d. fourth
A metal has a work function of 4.50 eV
Find the maximum kinetic energy of the photoelectrons if light of wavelength 250 nm shines on the metal. (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 0.53 eV B) 0.00 eV C) 0.37 eV D) 0.47 eV
A loop of wire (resistance = 2.0 m?) is positioned as shown with respect to a long wire which carries a current. If d = 1.0 cm, D = 6.0 cm, and L = 1.5 m, what current is induced in the loop at an instant when the current in the wire is increasing at a rate of 100 A/s?
a.
34 mA
b.
30 mA
c.
27 mA
d.
38 mA
e.
0.50 mA