平均自由程，平均自由时间，散射几率？

A . ['https://assets.asklib.com/psource/2016071713152316030.jpg 和https://assets.asklib.com/psource/2016071713152742735.jpg 都增大B .https://assets.asklib.com/psource/2016071713152316030.jpg 和https://assets.asklib.com/psource/2016071713152742735.jpg 都减小C .https://assets.asklib.com/psource/2016071713152742735.jpg 减小而https://assets.asklib.com/psource/2016071713152316030.jpg 增大D .https://assets.asklib.com/psource/2016071713152742735.jpg 增大而https://assets.asklib.com/psource/2016071713152316030.jpg 减小

A . 1 B . 2 C . 3 D . 4

A .https://assets.asklib.com/images/image2/2017051110385098774.jpg 和https://assets.asklib.com/images/image2/2017051110380742552.jpg 都增大B . 和https://assets.asklib.com/images/image2/2017051110385098774.jpg https://assets.asklib.com/images/image2/2017051110380742552.jpg 都减小C .https://assets.asklib.com/images/image2/2017051110385098774.jpg 减小而https://assets.asklib.com/images/image2/2017051110380742552.jpg 增大D .https://assets.asklib.com/images/image2/2017051110385098774.jpg 增大而https://assets.asklib.com/images/image2/2017051110380742552.jpg 减小

A . 增大，不变 B . 不变，增大 C . 和都增大 D . 和都不变

A .https://assets.asklib.com/images/image2/2017051115145513283.jpg 增大，https://assets.asklib.com/images/image2/2017051115140643714.jpg 不变B .https://assets.asklib.com/images/image2/2017051115145513283.jpg 不变，https://assets.asklib.com/images/image2/2017051115140643714.jpg 增大C .https://assets.asklib.com/images/image2/2017051115145513283.jpg 和都https://assets.asklib.com/images/image2/2017051115140643714.jpg 增大D .https://assets.asklib.com/images/image2/2017051115145513283.jpg 和都https://assets.asklib.com/images/image2/2017051115140643714.jpg 不变

A . 减小而不变 B . 减小而增大 C . 增大而减小 D . 不变而增大

A .https://assets.asklib.com/psource/2015103009391613855.jpg B .https://assets.asklib.com/psource/201510300939308761.jpg C .https://assets.asklib.com/psource/2015103009394225223.jpg D .https://assets.asklib.com/psource/2015103009395456368.jpg

A . 正确 B . 错误

A . 增大，但不变 B . 不变，但增大 C . 和都增大 D . 和都不变

在一个标准大气压下,氮气分子的平均自由程为6.0×10-8m,而目前实验室能够获得的极限真空约为<img src='https://img2.soutiyun.com/ask/2020-05-11/958045652421033.png' />. (1)当温度不变时,在该极限真空条件下,氮气分子的平均自由程为多少？ (2)若温度T= 27℃ ,在两种大气压强条件下,氮气分子的密度各为多少？