Based on the information given the wall is an example of a(n) physical barrier.
Physical barrier is barrier that block or obstruct the flow of communication thereby making it difficult for the receiver to hear.
Physical barrier can tend to lead to ineffective communication between two or more people due to the disruption of failure in communication that occur as a result of the barrier.
Wall is an example of physical barrier as they can prevent effective communication thereby by making it hard for the receiver to hear what the sender communicated to him or her.
Inconclusion the wall is an example of a(n) physical barrier.
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