I'm not sure about differences in these two sentences.
- I hear a noise.
- I hear noise.
Is noise something you can count? What is the difference between the two?
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Noise can work as a countable or uncountable noun.
Continuous noise would be uncountable, such as static from an old CRT TV tuned to a channel with nothing transmitting on it, or the sound of an engine from a car.
Noises like the sound of someone banging something, knocking on something, or short sounds with well defined beginnings and endings are countable.
It's all about the sense implied. In the first sentence(I hear a noise.) noise is synonymous with a sound. In this sense, the word refers to a distinct (loud) sound that can distract the mind for a short moment.
We say: 'Don't make a noise, please.' ['Please keep quiet.] Here, the word refers to a noisy atmosphere (as in a classroom) created by talking.
In the second sentence (I hear noise), the word refers to some constant unpleasant sound from the traffic, industrial facilities, crowded places, and so on. It is the unpleasant atmosphere created by the blending of various sound sources. We say-
The difference in the given pair of sentences will be clear from the extensions: