The center of our galaxy is believed to be occupied by the radio source known as ____________________
Fill in the blank(s) with correct word
Sgr A*
Sagittarius A*
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Active galaxies emit most of their radiation as visible light
Indicate whether the statement is true or false
If 150 kcal of heat raises the temperature of 2.0 kg of a material by 400 F°, what is the specific heat capacity of the material?
A) 0.34 kcal/kg ? C° B) 0.75 kcal/kg ? C° C) 0.19 kcal/kg ? C° D) 1.35 kcal/kg ? C°
A neon light (thin hot neon gas in a sealed tube) gives us:
A) a continuous spectrum, since the neon is hot enough to glow. B) a few bright emission lines, telling us the gas is neon. C) a continuum, with dark lines identifying the neon atoms that are present. D) a lot of random bright red lines due to the motion of the hot atoms. E) nothing visible to us, but a lot of infrared lines as heat.
The Doppler effect due to motion of excited atoms in a glowing gas tends to make the spectral lines slightly
A) thicker. B) thinner. C) more numerous. D) none of the above