There are two types of sonarâactive and passive. Active Sonar. Active sonar transducers emit an acoustic signal or pulse of sound into the water. If an object is in the path of the sound pulse, the sound bounces off the object and returns an âechoâ to the sonar transducer. If the transducer is equipped with the ability to receive signals, it measures the strength of the signal.
Define delegations. delegations synonyms, delegations pronunciation, delegations translation, English dictionary definition of delegations. n. 1. a. The act of delegating. b. The condition of being delegated. 2. A person or group of persons officially elected or appointed to represent another or...
Here is a pretty nice explanation of delegation on iOS. Delegation, is a mechanism in which one object acts on behalf of, or in coordination with, another object. For example, when you use a UITableView, one of the methods you must implement is tableView:numberOfRowsInSection:. You canât expect the UITableView to know how many rows you want to have in each section, as this is application-specific.