Intensity: A sinusoidal electromagnetic wave is propagating in vacuum. At a given point and at a particular time the electric field is in the +x direction and the magnetic field is in the -y direction, and at that point the intensity of the wave is 0.45 W/m2. (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) (a) What is the direction of propagation of the wave?(b) What is the electric field amplitude at the given point?
What will be an ideal response?
(a) -z direction (b) 18 V/m
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The saturation magnetization of nickel measured at room temperature is 5.1×105 A/m.
(a) Calculate the average number of Bohr magnetons on a nickel atom, knowing that nickel has an FCC structure with an atom at 0,0,0. At room temperature the lattice parameter is 0.352 nm. (b) Compare your answer to part (a) with the theoretical number of Bohr magnetons based upon the atomic electron structure of nickel, and explain any possible difference.
Halley's comet has an orbital period of 76 years, what is the average distance of Comet Halley from the Sun?
a. 51 AU b. 18 AU c. 114 AU d. 660 AU e. 38 AU
All real engines are less efficient than the Carnot engine because
A. they do not operate through the Otto cycle. B. they do not operate through a reversible cycle. C. the working substance does not maintain a constant volume through the cycle. D. the working substance does not maintain a constant pressure through the cycle. E. the working substance does not maintain a constant temperature through the cycle.
Which of the following gases is a trace natural constituent of the air?
a. Ar b. SO2 c. CO d. NO2