Why are molecular lines usually found in infrared and radio regions, not as visible lines?
What will be an ideal response?
Molecules are easily broken up at high temperatures, so few can exist in even the coolest stars. At lower temperatures, there is still enough energy to raise molecules into excited rotational and vibrational states so they emit in the infrared and radio.
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The optical classification of galaxies was pioneered in the 1930s by ________
Fill in the blank(s) with correct word
The melting point of aluminum is 660°C, its latent heat of fusion is 4.00 × 105 J/kg, and its specific heat is 900 J/kg ? K
If 300 kJ of thermal energy are added to 442 g of aluminum at 100°C, what is the final state of the system? That is, how much is liquid, how much is solid, and what is its temperature?
What is the angular momentum of the Moon about the Earth? The mass of the Moon is 7.35 × 10^22 kg, the center-to-center separation of the Earth and the Moon is 3.84 × 10^5 km, and the orbital period of the Moon is 27.3 days. Ignore the small offset of the center of mass of the system from the center of the Earth in your calculation
A current in a long, straight wire produces a magnetic field. The magnetic field lines:
a. go out from the wire to infinity. b. form circles that go around the wire. c. come in from infinity to the wire. d. form circles that pass through the wire.