WILL GIVE BRAINLIEST AND 30 POINTS!
Which materials are present in an NPN transistor?

A. all negative type semiconductor materials on a positive plate
B. all positive type semiconductor materials on a negative plate
C. an n-type semiconductor sandwiched between p-type semiconductor materials
D. a p-type semiconductor sandwiched between n-type semiconductor materials

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.