问题标题：
【国外物理题（概念）,关于声波的Wecannotseeasoundwave.Howeverwecanseearepresentationofitbyconnectingamicrophoneto————————(b)Thepitchofasounddependson——————————(c)Theloudnessof】
问题描述：
国外物理题（概念）,关于声波的
Wecannotseeasoundwave.Howeverwecanseearepresentationofitbyconnectingamicrophoneto————————
(b)Thepitchofasounddependson——————————
(c)Theloudnessofasounddependson————————————
第二个问题哈：
Awirecarriesacurrent.Thewireisperpendiculartoamagneticfield.Aforceactson
thewireandthewiremoves.
(a)Thiseffectisusedinad.c.motor.
(i)Whatdoestheabbreviationd.c.standfor?
(2)Apartfromelectricmotors,nameoneotherdevicewhichusesthiseffect_______________
三：关于左手定律
Thefirstfingerpointsinthedirectionofthe——————whichisfrom——————to——————
Thesecondfingerpointsinthedirectionofthe---------whichis-from--------to-----------
Thethumbpointsinthedirectionofthe——————
Statetwowaysinwhichtheforceactingonthewirecanbeincreased?
孙新岸回答：
(b)Frequency(c)Amplitude频率振幅
（二）（i）direct-current（2）变压器Transformer
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