State the factor that determines the pitch of a note

State the factor that determines the loudness of the sound heard

Name the characteristic of sound affected due to a change in it's (i) amplitude, (ii) wave form, and (iii) frequency.

The sketches I to IV in figure below show sound waves, all formed in the same time interval.

Which diagram shows

(i) a note from a musical instrument,

(ii) a soft (or feeble) note,

(iii) a bass (or low frequency) note.