百度作业网国外物理题（概念）,关于声波的
来源：学生作业帮 编辑：百度作业网作业帮 分类：英语作业 时间：2024/05/08 13:03:50
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?
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?
(b) Frequency (c) Amplitude 频率 振幅
（二） （i） direct-current （2） 变压器 Transforme
（二） （i） direct-current （2） 变压器 Transforme