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The word noise is taken from the Latin word 'nausea' and is defined as unwanted or unpleasant sound that causes discomfort. Source Intensity (dB) Breathing 10 Broadcasting studio 20 Trickling clock 30 Library 30 – 35 Normal conversation 35 – 60 Telephone office noise 60 – 80 Alarm clock 70 – 80 Traffic 50 – 90 Motorcycle 105 Jet fly over 100 – 110 Train whistle 110 Air craft 110 – 120

1. Noise is defined as pleasant sound.
2. Noise is defined as unwanted or unpleasant sound.
3. Noise is defined as sound with low intensity.
4. Noise is defined as sound with high intensity.

Correct answer: Noise is defined as unwanted or unpleasant sound.

Solution

The passage explicitly defines noise as an unwanted or unpleasant sound that causes discomfort. The intensity table is extra information and does not change the definition.

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