Can y’all help me Fa brainliest show ya work

What is the study of how matter and energy interact? a. biology b. physics c. planetary science d. chemistry

Define dew point. i am writing this part to be able to ask the question

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?