note sound

Question 1

Why does the same note sound different?

Answer 1

You hear the sound because something is vibrating
The fundamental vibration is the main frequency and determines the pitch we hear
The combination of the fundamental and harmonic overtones determines the timbre/ quality of the note heard
The combination (and the loudness is produced) is different for each instrument so that’s why the same notes sound different

Question 2

Harmonic frequencies - wind instruments 1

Answer 2

Open at one end. Closed at other
NODE at the closed end, ANTINODE at the open end
Only odd harmonics can form under this boundary condition

Question 3

Harmonic frequencies - wind instruments 2

Answer 3

Open at both ends
ANTINODES at both ends

Question 4

Speed of a transverse wave on a string

Answer 4

For waves traveling along a string in tension, the speed of a wave is given by:

Where:
v=wave speed (m/s)
T= tension in the string in N
μ= mass/unit length (kg/m)

Question 5

Factors that can alter the pitch of notes produced by string instruments

Answer 5

The pitch of a note corresponds to frequency. Changing the pitch means changing the frequency of vibration

The pitch of the note from a stretched string can be altered by
-Changing the tension of the string- tighter string gives a higher pitch looser string gives a lower pitch
-Changing the length of the string- longer strings a lower pitch, shorter string gives higher pitch
-Using strings of different mass per unit length- heavier strings gives a lower pitch, lighter string gives a higher pitch