太阳能空气集热器，底面及侧面为隔热材料，顶面为透明玻璃板，集_爱下问搜题

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问题问答题

太阳能空气集热器，底面及侧面为隔热材料，顶面为透明玻璃板，集热器容积为V₀，开始时内部封闭气体的压强为P₀．经过太阳暴晒，气体温度由T₀=300K升至T₁=450K．

（1）求此时气体的压强，

（2）说明此过程压强变化的微观原因．

答案

（1）设升温后气体的压强为P₁，由于气体做等容变化，

由查理定律得

p0

T0

=

p1

T1

解得：P₁=

P0T1

T0

=

450P0

300

得P₁=1.5P₀

（2）微观原因：气体体积不变，分子密集程度不变，温度升高，气体分子平均动能增大，分子撞击容器壁的力增大，导致气体压强变大．

答：（1）此时气体的压强为1.5P₀

（2）此过程压强变化的微观原因：气体体积不变，分子密集程度不变，温度升高，气体分子平均动能增大，分子撞击容器壁的力增大，导致气体压强变大．

阅读理解

阅读理解：

Dear Mr. Wang, Someone comes to the office to see you in the morning, but you and your wife are out. He comes here at 10am. Because he is very busy, he goes away half an hour later. He tells me that he is your classmate at college(大学). Now he teaches Chinese in a high school(高中) in this city and he lives near the No. 6 Middle School. He is a very tall man with short hair. He wears a pair of glasses. He tells me his telephone number is 33426685. He is often at home at 7:00 pm. So you can call him in the evening.

1. The author(作者) writes this note(便条) to _____.

A. Mr. Wang

B. Mr. Wang’s wife

C. Mr. Wang’s classmate

D. me

2. Mr. Wang’s classmate is _____.

A. a teacher

B. a worker

C. a farmer

D. an actor

3. When is Mr. Wang’s classmate often at home?

A. In the morning

B. In the afternoon.

C. At 7:00pm.

D. We don’t know.

4. How long does Mr. Wang’s classmate stay in the office?

A. Ten hours.

B. An hour.

C. Two hours.

D. Half an hour.

5. Which of the following is TRUE?

A. Mr. Wang and his wife are classmates.

B. Mr. Wang’s classmate is short.

C. Mr. Wang goes out with Mrs. Wang in the morning.

D. Mr. Wang’s classmate meets Mr. Wang in the morning.

单项选择题

面色淡白，头晕眼花，心悸失眠，舌淡脉细此属( )

A．气虚证
B．血虚证
C．津亏证
D．阳虚证
E．阴虚证