[ 517 ] Physical Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Cindy is conducting an experiment on human hearing and musical notes. She blindfolds a subject and plays a reference note like middle C (C 4 ). Next, she plays another note and asks the subject whether the note was higher or lower relative to the reference note. She indicates a higher pitch with one or more plus signs and a lower note with one or more minus signs. She organizes her subject’s responses in a table like this: Musical Note Relative Pitch G 3 – – A 3 – Middle C (C ) 4 0 D 4 + E 4 ++ Do we know how much higher musical note E 4 is than musical note G 3 , and how do we know this? Jill is watching the development of red color in a solution with time during a chemical reaction. She notes the time and rates the color on a scale of 1 to 10 with 1 being light red (almost pink) and 10 being dark red (almost purple). She expresses her data in a table. Time (minutes) Relative Red Color 1 1 2 3 3 5 4 6 5 6 After 1 minute, what color is the solution?