Describe the appearance of each of the three types of spectra described by Kirchhoff's laws. Describe how each of the three types of spectra is formed
What will be an ideal response?
(1) A hot solid, liquid, or dense gas emits electromagnetic radiation at all wavelengths and produces a continuous spectrum.
(2) An excited, low-density gas produces an emission, or bright-line, spectrum containing emission lines.
(3) A light source viewed through a low-density gas produces an absorption, or dark-line, spectrum containing absorption lines.
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Fill in the blank(s) with the appropriate word(s).
The half-angle of the conical shock wave produced by a supersonic aircraft is 60°. What is the ratio of the speed of the aircraft to the speed of sound?
A) 2.0 B) 1.7 C) 0.87 D) 1.2
An automobile traveling on a straight, level road at 25 km/h speeds up to 70 km/h in 20 s. What was the magnitude of the auto's acceleration, in meters per second squared?
If the current increases in a solenoid, the induced emf acts to
A) decrease the flux. B) increase the flux. C) first increase then decrease the flux. D) first decrease then increase the flux. E) have no effect on the flux.