In general, the narrower the spectral line of a star:
A) the hotter the star is.
B) the bigger the star is.
C) the denser the star is.
D) the smaller the star is.
E) the cooler the star is.
B
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Where would you find Van Allen belts of radiation?
a. Within Earth's core b. Within Earth's ozone layer c. Within Earth's magnetosphere d. Within Earth's mantle e. Within Earth's subduction zones
When an LRC series circuit is driven at resonance, which of the following statements about the circuit are correct? (There may be more than one correct choice.)
A) The inductive reactance and the capacitive reactance are both zero. B) The impedance of the circuit is zero. C) The impedance of the circuit has its minimum value. D) The impedance of the circuit has its maximum value. E) The inductive reactance and the capacitive reactance are exactly equal to each other.
The U-tube shown is rotated about the left vertical leg at 100 rpm. The highest pressure in the U-tube is nearest:
(A) 5.6 kPa
(B) 4.2 kPa
(C) 2.2 kPa
(D) 0.8 kPa
If the intensity of an electromagnetic wave is 80 MW/m2, what is the amplitude of the magnetic field of this wave? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2)
A) 0.82 mT B) 0.33 µT C) 10 T D) 14 T E) 0.58 mT