问题 问答题

如图所示,A、B为两个相同的音叉,C是粘在音叉叉股上的 * * 面镜,D为一较大的平面镜,E为固定的小激光笔,F 为天花板.实验时,用橡皮锤敲响音叉A,听到声音的同时,会观察到天花板上的光斑位置会发生变化.请写出这个现象中包含的至少四条物理知识.

答:(1)______,(2)______,(3)______,(4)______.

答案

①光斑位置变化,说明音叉在振动;

②声音的传播需要介质.声音可以在固体、液体、气体中传播.

③天花板上的光斑位置发生变化,说明反射光线随入射光线的变化而变化.

④用橡皮锤敲响音叉B,音叉振动发出声音,声音将能量传递给音叉A,所以看到A音叉也振动.

参考答案为:(1)发声的物体在振动;(2)声音可以在空气中传播;

(3)光的反射; (4)声音能传递能量.

阅读理解

    International Weather Forecast(January 18 th,2008)   

Paris Weather

·Today:Plentiful sunshine High 59F.Winds NE at 5 to 10 mph.

·Tonight:Generally clear.Low near 35F.Winds light and variable.

·Tomorrow:A mainly sunny sky.High 59F.Winds ENE at 5 to l0mph.

·Tomorrow night:A mostly clear sky.Low 36F,Winds light and variable.

New York Weather   

·Today:Cloudy with rain and snow showers Temps nearly steady in the mid 30s.Winds SE at 5 to 10 mph.Chance of precip 40%.

·Tonight:Rain and snow showers this evening changing to rain showers overnight Low 34F.Winds ESE at 5 to 10 mph Chance of precip 60%.

·Tomorrow:Cloudy skies early will become partly cloudy later in the day.High around 45F.Winds WNW at l0 to 20mph.

·Tomorrow night:Partly cloudy early with increasing clouds overnight Low 29F.Winds W at 5 to10 mph.

London Weather

·Today:Cloudy and windy.High 56F. Winds WSW at 20 to 30 mph.

·Tonight:Partly cloudy and windy.Low 43F.Winds W at 20 to 30 mph.

·Tomorrow:Windy with occasional light rain.High 58F.Winds SW at 20 to 30 mph.Chance of rain 70%.

·Tomorrow night:Cloudy and windy.Periods of light rain early.Low 54F.Winds WSW

at 20 to 30 mph,Chance of rain 60%.

Sydney Weather

·Today:Cloudy with periods of rain.High 73F.Winds NE at 10 to 15 mph.Chance of rain 70%.Rainfall around a quarter of an inch.   

·Tonight:Rain.Low near 70F.Winds NNE at 10 to 15 mph.Chance of rain 70%.Rainfall near a quarter of an inch.

·Tomorrow:Showers in the morning with isolated thunderstorms arriving in the afternoon.High 78FWindsNNE at 5 to10 mph.Chance of rain 40%.

·Tomorrow night:An isolated thunderstorm possible during the evening.then occasional showers overnight.Low near 70F.Winds WNW at 5 to 10 mph..Chance of rain 40%.

65.Which city has the strongest wind on January 19th?

A.Paris.               B.New York.        C.London.          D.Sydney.

66.There will be thunderstorms in Sydney oil      .

A.the evening of January 18th                          B.the afternoon of January 18th

C.the morning of January 19th                         D.the afternoon of January 19th

67.If you go on a tour on January l8th,which of the following places of interest is the most favorable according to the weather report?

A.The Eiffel Tower.                                 B.Statue of Liberty.

C.Big Ben.                                                 D.The Sydney Opera House.

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