问题
选择题
质量相同、温度相同的氢气和氧气,它们的( )
A.分子数相同
B.内能相同
C.分子平均速度相同
D.分子的平均动能相同
答案
答案:D
不考虑气体分子的势能,气体的内能只有分子动能,温度是物体的分子热运动平均动能的标志,温度相同,平均动能相同.故选D,
质量相同、温度相同的氢气和氧气,它们的( )
A.分子数相同
B.内能相同
C.分子平均速度相同
D.分子的平均动能相同
答案:D
不考虑气体分子的势能,气体的内能只有分子动能,温度是物体的分子热运动平均动能的标志,温度相同,平均动能相同.故选D,
A: Hi, Mary. You were not at school yesterday. 小题1: B: Oh, I had a headache and I had to ask for a sick leave. A: I’m sorry to hear that. 小题2: B: Yes,my mother took me to the hospital. The doctor looked me over and said I had caught a cold. A: 小题3: B: Yes,a little.The doctor told me to take medicine three times a day and drink more water. A: 小题4: B: Yes, much better. A: 小题5: B: I will. Thanks a lot.
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