You live at a latitude of 39° S. What is the angle between the southern horizon and the south celestial pole?
a. 45°
b. 23.5°
c. 39°
d. 51°
e. The answer depends on the day of the year.
C
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A. Circular diffraction B. Scattering off impurities C. Thin film interference D. Uneven magnification
The radiation era lasted for only the first few billion years of the Big Bang
Indicate whether the statement is true or false
An electromagnetic wave has a peak electric field of 3.0 kV/m
What is the intensity of the wave? (c = 3.0 x 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 24 kW/m2 B) 12 kW/m2 C) 8.0 kW/m2 D) 4.0 kW/m2
If the current flowing through a circuit of constant resistance is doubled, the power dissipated by that circuit will
A) quadruple in magnitude. B) double in magnitude. C) decrease to one-half of what it was. D) decrease to one-fourth of what it was.