a monotone sound
A leap in music is when the interval between one note and the next is larger than a step (or 2nd). An example is C to E.
A dotted quarter note. (One beat for the quarter note and half a beat for the dot.)
A conch shell when blown produces a very loud booming blast, a little like blowing one note very loudly on a trumpet.
pitch appears to change
No. A one beat note is called a crotchet and a two beat note is called a minim.
If your finger is just lightly held over a guitar or bass string it is called a "muted note". In order to produce a sound on a guitar or bass you must either have you finger placed firmly on one of multiple frets. When no frets are held that is called an open note, or string.
Note length is a relative value, so the physical length of the sound would depend on the tempo of the concrete piece of music. If we take tempo largo (about 44-52 beats per minute), one quarter note would last 60/44=1,36 seconds. So one 128th note would sound 32 times shorter, that is a little more that 4 milliseconds.
They are called waves.
Its called an octave It must be an 8th note, assuming that the time signature is 4/4.
Presuming you're in crotchet time e.g. 4 time 4 an eight beat note is called a breve a four beat note is called a semibreve a two beat note is called a minim a one beat note is called a crotchet a half beat note is called a quaver a quarter beat is called a semiquaver an eighth(1/8) beat is called a demisemiquaver
generally the bass instrument, I play the baritone saxophone and it stays at the same beat mostly with the bass clarinet.