How can Kirchhoff's Laws be used to deduce something about the nature of the light source?
What will be an ideal response?
A continuous spectrum will peak at a certain color, giving us the temperature of the source. But a continuum can be created by any dense hot body, be it solid, liquid, or gas, and we know nothing of its composition. Emission lines reveal the component atoms in the thin hot gas, and Doppler shifts the motion of the gas atoms. Likewise the absorption lines reveal composition and motion, but that the gas must be too cool to emit the bright line spectrum.
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A person standing waist-deep in a swimming pool appears to have short legs because of light
A) reflection. B) absorption. C) interference. D) diffraction. E) refraction.
What do meteorites reveal about the solar system?
A) They reveal that the solar system once contained 10 planets. B) They reveal that the early solar system consisted mostly of hydrogen and helium gas. C) They reveal that the age of the solar system is approximately 4.6 billion years. D) They reveal that meteorites are much older than the comets and planets. E) Nothing, because they come from other star systems.
If NASA wants to put a satellite in a circular orbit around the sun so it will make 2.0 orbits per year, at what distance (in astronomical units, AU) from the sun should that satellite orbit? The earth's orbit is 1.0 AU from the sun
A) 7.6 AU B) 0.63 AU C) 0.50 AU D) 2.0 AU E) 0.71 AU
What is the total energy of a proton moving at a speed of 2.4 × 10^8 m/s? (proton mass is 1.67 × 10^?27 kg and c = 3.00 × 10^8 m/s)
a. 1.91E–10 J b. 1.77E–10 J c. 2.51E–10 J d. 2.44E–10 J e. 9.02E–11 J