During which type of radioactive decay is the mass number of a nucleus reduced by four?
O A. Beta decay (electron)
B. Alpha decay
C. Beta decay (positron)
D. Gamma decay

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?