How does the entropy of 1 mol of helium gas in a container at room temperature compare to 1 mol of argon gas in an identical container at the same temperature?
A. The helium gas has greater entropy.
B. The argon gas has greater entropy.
C. Both gases have the same entropy.
D. One needs to know more to answer definitively
B. The argon gas has greater entropy.
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Energy in Nuclear Reactions: An electron and a positron, both essentially at rest, annihilate each other, emitting two identical photons in the process. What is the wavelength of these photons? The mass of an electron or positron is 9.11 × 10-31 kg. (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
A. 1.21 × 10-12 pm B. 1.73 pm C. 2.42 pm D. 3.07 pm E. 3.46 pm
When the Moon passes directly between the Sun and the Earth, we see a lunar eclipse
Indicate whether the statement is true or false
When an ice skater twirling on the point of a skate draws her arms in she ends up whirling faster. This is because
A. linear momentum is conserved. B. angular momentum is conserved. C. rotational energy is conserved. D. a net external torque acts on the skater.
A 2.3 cm tall statue is 15. cm in front of a convex mirror. The mirror radius of curvature is 18. cm
(a) Is the image real or virtual? (b) How far is the image from the mirror? (c) Is the image upright or inverted? (d) How high is the image?