10 joules of heat energy are transferred to a sample of ideal gas at constant pressure. As a result, the internal energy of the gas
A. increases by 10 J
B. increases by less than 10 J
C. increases by more than 10 J
D. remains unchanged.
B. increases by less than 10 J
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A ruby laser delivers a 2.28-J pulse in approximately 50 nanoseconds. The wavelength of the light is 694.4 nm. At least how many atoms within the ruby rod had to be excited to allow this high-energy laser pulse? (h = 6.63 × 10^-34 J×s, c = 3.00 × 10^8 m/s, 1 eV = 1.6 × 10^-19 J, and 1 nm = 10-9 m)
a. 3 × 10^19 c. 8 × 10^18 b. 4 × 10^18 d. 6 × 10^20
Earth orbits the Sun _____
A) once a year B) twice a year C) three times a year D) four times a year
Hubble's constant is a "constant" in that its value
A) is the same across all of space and does not change on human time scales. B) stays the same at all times. C) is a value calculated from models, and therefore not affected by observations. D) always stays the same unless the expansion rate is accelerating.
Titan is Neptune's largest satellite
a. True b. False Indicate whether the statement is true or false