八年级物理学教卷7.5 声现象（Eight grade physics teaching volume 7.5 sound phenomenon）.docVIP

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八年级物理学教卷7.5 声现象（Eight grade physics teaching volume 7.5 sound phenomenon）.doc

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八年级物理学教卷7.5 声现象（Eight grade physics teaching volume 7.5 sound phenomenon）

八年级物理学教卷7.5 声现象（Eight grade physics teaching volume 7.5 sound phenomenon） This paper consists of a bean with AA Doc document may at the WAP end of the browsing experience poor. Suggest you select TXT, or download the source file to the machine view. Fengjie County Feng Ping secondary school Nine grade physics Acoustic phenomenon (review) Topic: acoustic phenomena: class leader review: The first part of the sound class type: review class leadership: audit group: Standby time: 1 Name: Du zhou: (a) preview, preview guide (Guide). Hand hold the 1. textbooks to illustrate the pronunciation P35 page figure 3-6 phenomenon: all objects are in the sound of the tuning fork, and stop the pronunciation, this phenomenon indicated that stop sound stops. Vibrating object. Spread called 2. sound, not sound. In the air, to see the sound vibration, heard the sound. Acoustic wave invisible to spread the sound waves into the Master ear, 3. acoustic sound caused by the velocity of sound . In general, V v v solid liquid gas, sound travels at 15 C, 15 C V 15 in the air is km/h, speed in the vacuum m/s 0m/s 0m/s (no sound). 0m/s reflected and formed. If 4. is due to the echo echo sound in the propagation of the obstacle is reflected back Master ear than the original sound late above s ear can separate the echo with the original sound area, the obstacles to the listeners distance is at least M. In the room than the conversation in the wilderness sounds loud, because the room is relatively small space for the echo to Master ear than the original sound late, lack of 0.1s and acoustic echo mixed together to strengthen the original sound. 5 physics perspective: music is the body vibration rules of musical sound, listen. Noise refers to the sounding body to do random vibration, grating voice. The perspective of environmental protection: noise refers to hamper the normal rest, study and work in the sound, and the voice of the people to listen to the voice of the interference. Tone:. With the hard