An explosion is accompanied by light, heat, and loud sound.
1. Give an example of a chemical change which is accompanied by the evolution of heat light and sound energy.
2. The substance which loses electrons is said to be______ whereas the one which gains electrons is said to be_____
(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.
Characteristic of sound by which loud and soft sounds can be distinguished is ___ .