A sound source is placed in the center of a very wide and long room that has a low ceiling. Assume that the ceiling and floor are constructed of a material that absorbs the sound completely. In this situation, how would the intensity of the sound heard vary if a person moves from a distance of 10 meters from the source to a distance of 20 meters from the source?
1.The sound would have about the intensity 20 m from the source that it has 10 m from the source.
2.The sound would have about the intensity 20 m from the source that it has 10 m from the source.
3.The sound would have about the same intensity 20 m from the source that it has 10 m from the source.
4.The sound would have about twice the intensity 20 m from the source that it has 10 m from the source.
Question 2
A ringing alarm clock is placed in a bell jar, which is then sealed, and the air is pumped out of it. Which effect will most likely occur?
1.The sound of the ringing alarm clock will get louder as the air is pumped out.
2.The sound of the ringing alarm clock will get softer as the air is pumped out.
3.No noticeable change will occur as the air is pumped out.
4.The sound will diminish completely immediately after the air has begun to be pumped out.
Path of sound vibrations.
A patient examination room should be simple and efficiently designed.
The physician uses percussion—tapping—to detect sound or vibration.
Model of a purple bacterial reaction center complex
#38.Genetically identical organisms derived from a single genetic source are #39
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