Which of the following professionals would provide this warning

How many molecules are present in 3 mols of silicon dioxide (sio2)?

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=

Which property is expressed in distance units? o a. period o b. wavelength o c. speed o d. frequency