Where are red giants on the H-R diagram?
A. upper left
B. lower right
C. lower left
D. upper right
Answer: A
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Which of the following is true of wavelengths of signals sent into space?
A) Wavelengths longer than 100 cm are absorbed in Earth's atmosphere. B) The interval between the 21-cm spectral line of neutral hydrogen and the 18-cm line of OH has very high background interference. C) Wavelengths longer than 100 cm get lost in the background noise of the Milky Way Galaxy. D) The interval between the 21-cm spectral line of neutral hydrogen and the 18-cm line of OH is narrow and can be monitored easily.
A bright red nebula is called an HII region when it contains
A. molecular hydrogen gas, H2. B. hydrogen atoms which have been ionized by ultraviolet radiation. C. hydrogen which is generating 21-cm radio waves. D. hot hydrogen gas thermally glowing.
The melting point of aluminum is 660°C, its latent heat of fusion is 4.00 × 105 J/kg, and its specific heat is 900J/kg ? K. How much thermal energy must be added to 500 g of aluminum originally at 27°C to completely melt it?
A) 485 kJ B) 395 kJ C) 273 kJ D) 147 kJ E) 14 kJ
A wire carries a current of 11.4 A in a direction that makes an angle of 11.4° with a magnetic field of magnitude 11.4 × 10-3 T. The magnitude of the force on 11.4 cm of this wire is
A) 1.48 × 10-2 N. B) 0.013 N. C) 11.4 × 10-3 N. D) 2.93 × 10-3 N. E) 0.130 N.