Alicia is talking on her cell phone to her friend Maya.If Maya is in a crowded subway terminal,Alicia finds that she has to nearly shout for Maya to be able to hear her.However,when Maya is in a meadow on her grandparents' farm she can easily tell what Alicia is watching on TV as they talk.This is one illustration of

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This scenario is an example of the signal-to-noise ratio. In a crowded subway terminal, there is a lot of background noise that makes it difficult for Maya to hear Alicia's voice, whereas in a quiet meadow, there is very little background noise, making it easier for Maya to hear Alicia's voice and even pick up on what she is watching on TV.

Alicia Is Talking on Her Cell Phone to Her Friend