Which of the following can be determined by using the Doppler Effect? 
Definitions:
Social Network
An online platform or service where individuals can connect, communicate, and share content with others in a virtual community.
Nodes
Nodes are points in a network where pathways intersect, serving as connection or redistribution points in various systems, such as telecommunications, computer networks, or social networks.
Maven
An expert or connoisseur, often referring to a person who has special knowledge or experience; used particularly in the context of marketing to describe influential figures.
Niche Market
A specialized segment within the marketplace characterized by a unique demand and specific consumer preferences, often less competitive than broader markets.
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