Selection bias
is a kind of error that occurs when the researcher decides who is going to be studied.
Answer: Displays his requirements to understand about market
Explanation: According to the situation mentioned in the question, Francisco is indulging in the research process by attending the meetings regarding swimming for gathering the information about goggle preferences of swimmers.
By doing this research , he is trying to know about the customer requirement in fields like swimming,snowboarding and skiing, demand of goggles in market etc.This step indicates he is trying to understand the market before establishing the website for selling goggles.
<u>Answer</u>:
Cell phones contain rechargeable batteries that transform chemical energy into electrical energy. When using your cell phone, electrical energy is first transformed into <u>Electromagnetic waves </u>that are transmitted through the air.
<u>Explanation</u>:
When chemical energy is converted into electrical energy in cell phones, then this electrical energy firstly transformed or converted into electromagnetic waves which travels through air. Then this electromagnetic wave is converted into sound energy due to which users are able to listen audio, music, movies etc on their mobile phones.
The electrochemical energy that stored in a cell is removed as electrical energy in the process of discharging. There are so many other thermal and electrochemical processes taking place at the same time.