山东省2022-2023学年第二学期九年级区域联考l物理试卷 答案(更新中)

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7.D【考查点】本题考查光的薄膜干涉【解析】从薄膜的上下表面分别反射的两列光是相干光，其光程差为△x=2d,即光程差为薄膜厚度的2倍，当光程差△x=入时表现为亮条纹，即当薄膜的厚度山=n·2时对应的条纹为亮条纹，故相邻亮条纹之间的薄膜的厚度差为2入，设上下薄膜间的夹角为9，题图中从左向右相邻亮条纹之间的距离变大，且条纹宽度逐渐变宽，则根据条纹间距公式△1=。知，tan0减小，即薄膜厚度的变2tan 0化率减小，D正确。

第二节（满分25分）读后续写The doors were all locked from the outside and what's more,I didnot have the keys.But luckily,the man forgot to lock the window ofthe kitchen.Both my brother and I managed to get out of the housethrough the window and we ran to the nearby police station and askedthem for help.The police arrived at our house as soon as possible.Andas a result,the man was caught.Just at the same time our parents came back home.The policeasked my family to go to the police station.At the police station thepolice told us that the man was a wanted robber,who pretended to sellcomic books and they had been looking for him for a long time.Thepolice praised my brother and me for our bravery.After we went backhome,I told my parents the whole story.They were thankful that wedidn't get hurt but they scolded me for not stopping my brother fromopening the door to strangers.I learned a lesson on safety andresponsibility.