Pleasant sounds are pleasing to the mind and often stimulates the brain. Noise often gives you headaches :)
A pleasant fart-sounding noise
In case of pleasant sound ie musical sound there will be only harmoic frequencies. It may be in the ratio 1:2:3:......... or 1:3:5:....... But noise is not harmonic and any frequency will be present with different amplitudes.
Pleasant sound can be any sound that doesn't harm or effect your ear drums.
A pleasant complex sound is a consonance, an unpleasant is a dissonance
pleasant sound? softness and low pitch unpleasant sound? loudness and low pitch
A faint sound is quiet or barely audible, often requiring careful listening to detect. It may be soft and subtle, making it difficult to hear clearly or distinguish from surrounding noise.
put an headset in your ear.then wala! you cannot hear any noise
The duration of Sound of Noise is 1.7 hours.
Silence is the opposite or antonym of sound.
A sound wave
There is no such "exact level". What one person considers a pleasant sound, another one might consider a nuisance - i.e., a noise. Whether a sound is a nuisance or not will also depend on the type of sound, and on the circumstances. For example, when you are at a dance you would find a fairly high level of sound acceptable; on the other hand, if you are trying to sleep, you would find a much lower level of sound a nuisance. There may be legal limits to how much sound (or noise) is allowed, but these, too, may vary depending on the country, and within one country, depending on the exact circumstances.
Relaxes you.