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

1#

97.26: The average speed of the 3qmxtcsjf*chxz m1*xg96; t3 atoms of a gas at 100 K is 200 m/s. What would most nearly be the average speed of the atoms at 3zs tx3tfcm3*cjg6h q*; x19x m00 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 bothxt2 9gxxhsr 8 f,imx2ag +- :w:uio*gh the copper and *mah+:i-f 9t :8hisxgwxgo 2xgu 2r,x water are at 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 enclo7dt d3,o0b td5 pzzom vr1+rk0sed in a cylindrical piston. When the gas is heated 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 kinetic theory of gases, when th zlbir,gdc38u6sxv834sr3g ke absolute temperature of an ideal gas doubles, the average kinetic ku 3vcb48,xg 83igdrzss 3r6lenergy of the molecules 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 molecules in a gas collide, thel :dszu.mkc 74n

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 (1;t51equb 67dfe sza nc7wi unamed “Physicsbowlium.” A pure 4-mole sample is sitting in a container at equilibrt7sd7fw u qune;1e(1b5 6zcaiium 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 temperature at whitg7q m/sfxe cpm/q jho)r*5fn ef/w7* ek+-8jch

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 in a container. The volume of the containervfr8 m 4pyy;ru45i6kt is reduced to half the original volume at constant temperature. According to kinetic theory, what is the besvfyu ;t68rkr5 m yi4p4t 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 insideytga4r .b+1hb,jc7h a / htlz8 a container with two moles of an ideal gas is 0.75 atm. The t,a1gazthc t+h7 b /8y.rl4bhjemperature 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 th; f7 sldkhqc0+,w;)m5 ek oibgeory of gases, which one of the following choices best represents the rms (root mean square) speed of 58 grams of a monatomic ideal gas at ak;k7do eqc 0+slgw,) bh5; mif 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 PhysicsBoy*z9lq lub+b(whi h:9w 1o 9bawlium (atomic 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 monatombbul 1 9iz:h wwloy*ah(9+9bqic ideal gas, what is the root-mean-square speed of the atoms of the gas if the sample is at $20^{\circ}C$?

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