Internal energy and r.m.s. speed - 题库网 (tiku.one)

1#

97.26: The average speed of the atoms of a gas at 100 K is 200 m/s. Wha qdm ;akhpc-:g4-8pi nt would most nearly be the: pah8qg-c kipd;m-4 n average speed of the atoms at 300 K?

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

01.29: A 200 gram sample of copper is submerged in 100 grams of water until bott6nk9 u0ae-fgqot d./ h the copper and water are ateg fa/t.kdt9o n u-06q the same temperature. Which of the following statements would be true.

A. the molecules of the water and copper would have equal average speeds

B. the molecules of the water and copper would have equal average momenta

C. the molecules of the water and copper would have equal average kinetic energies

D. the water molecules would have twice the average momentum of the copper molecules

E. the copper molecules would have twice the average speed of the water molecules

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.08: A gas is enclosed in a cylindrical piston. When the gas is heated,yz:iy dfk tj,btg9g/x/2e*o from $0^{\circ}C$ to $100^{\circ}C$, the piston is allowed to move to maintain a constant pressure. According to the Kinetic-Molecular Theory of Matter

A. the mass of the gas will increase

B. the number of molecules of gas must increase

C. the size of the individual molecules has increased

D. the average speed of the molecules has increased

E. the molecules continue to strike the sides of the container with the same energy

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

03.21: According to the +2cpu 2 0 anmpx4tvik*x5bd 4ekinetic theory of gases, when the absolute temperature of an ideal gas doubles, the average kinetic energy of the moleculid*bc2a x0 4ntk +m25u4xevppes of the gas

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

04.23: If two moleculrtvz3n 7f*l c:-)ctabes in a gas collide, then

A. total momentum is always unchanged.

B. velocities are always exchanged

C. both molecules always speed up.

D. total kinetic energy always increases.

E. velocities are always unchanged.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.40: A new monatomic ideal gas is discovered and named “Physicsbowlium.” ;x//b6osm id+q6ishqA pure 4-mole sa/imi;xq/s osh6 q6db +mple is sitting in a container at equilibrium in a $20.0^{\circ}C$ environment. According to the kinetic theory of gases, what is the average kinetic energy per molecule for this gas?

A. $4.14\times\:10^{-22}J$

B. $6.07\times\:10^{-21}J$

C. $2.02\times\:10^{-21}J$

D. 3652 J

E. The molar mass of the gas is needed to answer this question.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

07.38: Absolute zero is best described as that tem)yf *d7p t-yzgperature at which

A. water freezes at standard pressure.

B. water is at its triple point.

C. the molecules of a substance have a maximum kinetic energy.

D. the molecules of a substance have a maximum potential energy.

E. the molecules of a substance have minimum kinetic energy.

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

08.39: An ideal gas is enclosed pj6vuv. gnro ;v4-2 jyin a container. The volume of the container is reduced to half the original volume at constant temperature. According to kinetic theory,u;r2-gv .v v6pynj j4o what is the best explanation for the increase in pressure created by the gas?

A. The average speed of the gas particles decreases, but they hit the container walls more frequently.

B. The average speed of the gas particles is unchanged, but they hit the container walls more frequently.

C. The average speed of the gas particles increases as does the frequency with which they hit the container walls.

D. The average speed of the gas particles increases, overcoming the decreased frequency that they hit the container walls.

E. The internal energy of the gas increases.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

12.27: The pressure inside a contai4j:d7mrrpyy duq a1p1ab5ix k)zf 81za/ q3j2ner with two moles of an ideal gas is 0.75 atm. The ykzq x31a4fj1yp8 d2u7 ji1pm/)dqb5 r: raaztemperature of the gas is $100^{\circ}C$. The container maintains constant volume as the pressure is tripled. Which one of the following choices best represents the temperature of the gas after the pressure is tripled?

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

12.40: Using the kinetic theory of gases, which one of the following cnj 6d5,cf8 gyie*g(sl/zb,tld+ a pp3hoices best represents the rms (root mean square) speed of ji,l/*yf5,pe ad6 g(s8clb3dnz +tpg58 grams of a monatomic ideal gas at a pressure of 3.0 atm in an enclosed container of volume 6.0 L?

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

14.37: A new element is discovered and named PhysicsBowlium (atomic fmf .,sclh5kt-m8*ju symbol Phys). Its entry onto the standard periodic table of elements appears as in the figure (with Helium shown as well). Given a sample of Phys which acts as a perfect monatomic ideal gas, what is the r,km5mhlff c8*ut .sj -oot-mean-square speed of the atoms of the gas if the sample is at $20^{\circ}C$?

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