The Doppler effect causes sounds moving toward an observer to sound .

lower

louder

higher

softer

What type of nuclear decay causes the atomic number of an element to increase by 1?

Ateacher gives students four liquids commonly found in the kitchen - vinegar, apple juice, dish detergent, and milk - and ph indicator strips, which measure acidity. the teacher asks the students to put the liquids in order from most acidic to most basic. what type of investigation could the students conduct to determine the correct order for the liquids?

What is a possible explanation for a set of facts that can be tested by further investigations called