The statement is false. Sara's trouble with listening to the lecture in class because she had just had an argument with her best friend is not an example of physical noise.
A physical noise refers to a situation whereby communication is impeded by sound coming from outside the individual such as music blaring out of a horn speaker.
Another type of noise is psychological noise. This arises when the receiver of a message is distracted by his/her internal thought processes.
Sara is clearly experiencing a psychological and not a physical noise.
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