Question

) define the terms : loudness, noise , echo , reverberation

Answer 1

Hii:
LOudness:  loudness is the subjective perception of sound pressure. More formally, it is defined as, "That attribute of auditory sensation in terms of which sounds can be ordered on a scale extending from quiet to loud."

Noise: NASA researchers at Glenn Research Center conducting tests on aircraft engine noise in 1967

Noise is unwanted sound judged to be unpleasant, loud or disruptive to hearing. From a physics standpoint, noise is indistinguishable from sound, as both are vibrations through a medium, such as air or water. The difference arises when the brain receives and perceives a sound.

Echo: 

Echo samplesMENU0:00Clean signal, followed by different versions of echo.Problems playing this file? See media help.

In audio signal processing and acoustics, Echo is a reflection of sound that arrives at the listener with a delay after the direct sound. The delay is proportional to the distance of the reflecting surface from the source and the listener. Typical examples are the echo produced by the bottom of a well, by a building, or by the walls of an enclosed room and an empty room.

Reverbration: prolongation of a sound; resonance.

"electronic effects have been added, such as echo and reverberation"synonyms:resonance, echo, echoing, re-echoing
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Answer 2

loudness : this is quality of sound,which our human hears have certain limits to it
noise: which is unpleasant to our ears is called as noise
echo: a sound caused by reflection of sound waves froma surface back to the listener within 1second
reverberation:the sound which is reflected after 1. second is called as reverberation.or prolongation of sound is called as reverberation.