国外物理题（概念）,关于声波的We cannot see a sound wave.However we can see a representation of it by connecting a microphone to————————(b) The pitch of a sound depends on——————————(c) The loudness of

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国外物理题（概念）,关于声波的We cannot see a sound wave.However we can see a representation of it by connecting a microphone to————————(b) The pitch of a sound depends on——————————(c) The loudness of

国外物理题（概念）,关于声波的We cannot see a sound wave.However we can see a representation of it by connecting a microphone to————————(b) The pitch of a sound depends on——————————(c) The loudness of
国外物理题（概念）,关于声波的
We cannot see a sound wave.However we can see a representation of it by connecting a microphone to————————
(b) The pitch of a sound depends on——————————
(c) The loudness of a sound depends on————————————
第二个问题哈：
A wire carries a current.The wire is perpendicular to a magnetic field.A force acts on
the wire and the wire moves.
(a) This effect is used in a d.c.motor.
(i) What does the abbreviation d.c.stand for?
(2)Apart from electric motors,name one other device which uses this effect_______________
三：关于左手定律
The first finger points in the direction of the——————which is from ——————to——————
The second finger points in the direction of the--------- which is-from-------- to-----------
The thumb points in the direction of the——————
State two ways in which the force acting on the wire can be increased?

国外物理题（概念）,关于声波的We cannot see a sound wave.However we can see a representation of it by connecting a microphone to————————(b) The pitch of a sound depends on——————————(c) The loudness of
(b) Frequency (c) Amplitude 频率 振幅
（二） （i） direct-current （2） 变压器 Transformer

国外物理题（概念）,关于声波的We cannot see a sound wave.However we can see a representation of it by connecting a microphone to————————(b) The pitch of a sound depends on——————————(c) The loudness of 一道声学物理题关于声波的说法正确的是（ ）A声波是靠介质传播的B正常人耳能听到的振动频率范围约为20Hz到20000HzC在15℃时声波在空气中的传播速度约为340m/s,在水中传播较快D能传播声音的 下面关于海豚声波的问题怎么回答?0.海豚声波的具体概念~1.海豚的声波是多少.2.海豚的声波的传播距离,是怎么传播的.3.海豚的声波具体有些什么作用,各个作用中声波是如何变化的.4.海豚的 初中关于声的一道物理题答案是减弱声波的反射,但是那个凹凸不平的面不是会将声音进行多次反射的吗? 新闻节目现场连线时为什么会出现声音画面不同步的现象?这是一道物理题,初二下学期,关于电磁波,声波,无线电之类的 国外关于“老实人”的解释 国外有哪一个品牌是ca开头el结尾的 （物理）声波的频率在声波中,频率是什么意思? 关于杆秤的物理题 关于滑轮的物理题 关于电路的物理题, 关于光的物理题 关于滑轮的物理题 关于电路的物理题, 关于热力学的物理题 关于简谐运动的物理题 关于波的物理题 关于位移的物理题.