What is loudness of sound ? What factors does it depend on ?

On what factors does vaporization depend ?

What is heat of reaction and on what factors does it depend?

What is unit of loudness of sound.

On what factors does evaporation depend ?

(a) What is meant by the 'loudness' of sound? On what factor does the loudness of a sound depend? (b) Draw labelled diagrams to represent (a) soft sound, and (b) loud sound, of the same frequency.

What is optical rotation? On what factors does it depend?

What is angular dispersion? On what factors does it depend?