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参考答案
一.选择题
1. B
2. D
3. C
4. D
5. A
6. A
7. D
8. B
9. B
10. B
11. D
12. C
二.填空题
13. 人耳处,空气,5Hz
14. (1)光的色散,(2)绿,红,(3)3×10
15.②④⑤,③⑥
16. (1)凸,(2)变小,(3)变大
17. OB,30°,55°,下
18. 不变,65°
19. 远离,后缩,小
20. 不随,变大,曲线
21. (1)0,(2)变大,(3)2.5,变大
三.解答题
22. (1)作图略,(2)作图略,反射角 45°,(3)作图略
23. (1)振幅,放大振动效果,(2)越来越小,真空不能传声,(3)低,(4)音调与振动频率的关系,(5)BC
24. (1)②,(2)变大,(3)D,(4)同一直线,不是
25. (1)便于确定像的位置,比较像与物的大小关系,(2)茶色,垂直,后表面,(3)A,光屏上不能
承接到像,(4)C,(5)B,(6)0.7
26. (1)反射光,反射光消失,反射光线、入射光线和法线,(2)测量反射角和入射角的大小,(4)
光路可逆,(5)存在,(6)甲、乙,丙、丁,甲、乙、丙、丁
27. (1)小于,(2)右侧
28. (1)烛焰、凸透镜、光屏三者的中心在同一高度上,(2)蜡烛放在焦点上,(3)Ⅱ,放大,投影仪,
(4)D,(5)上,(6)B,(7)BC
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