Acetylsalicylic acid was developed in the Bayer laboratory in Germany in 1898 and sold under the brand name

As Cecilia is getting ready for the orchestra performance in which she is about to participate, she takes time to tune her violin. She listens carefully to the pitch of each string, which is indicated by the __________ of the sound wave it produces,

to determine if she needs to make an adjustment in the instrument. a. wavelength b. frequency c. timbre d. amplitude

Case study methods are often used to study __________ cases

a. controversial c. stratified b. rare d. random