The chemical composition of stars can be determined from lines in their spectra
a. True
b. False
Indicate whether the statement is true or false
True
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Calorimetry: A lab assistant drops a 400.0-g piece of metal at 100.0°C into a 100.0-g aluminum cup containing 500.0 g of water at 15.0°C. In a few minutes, she measures the final temperature of the system to be 40.0°C. What is the specific heat of the 400.0-g piece of metal, assuming that no significant heat is exchanged with the surroundings? The specific heat of this aluminum is 900.0 J/kg ? K and that of water is 4186 J/kg ? K.
A. 1900 J/kg ? K B. 2270 J/kg ? K C. 3300 J/kg ? K D. 3800 J/kg ? K E. 4280 J/kg ? K
Heavy atoms are not appreciably larger in size than light atoms because the nuclei of heavy atoms have more
A) mass. B) electric charge. C) nucleons. D) all of the above E) none of the above
How much heat would be required to melt 1.0 kg of LEAD, initially at room temperature? Assume room temperature to be 20°C
(c = 920 J/kg-C° Lf = 0.25 × 105 J/kg LV = 8.67 × 105 J/kg melts at 328.°C boils at 1744.°C)
A fixed-width page layout sets a specific ______ width for the page.
A. pixel B. em unit C. bit D. byte