1. Length: If you increase the length of the string, the frequency (pitch) of the sound will decrease, making the sound lower in pitch. Conversely, if you decrease the length of the string, the frequency will increase, resulting in a higher-pitched sound.
2. Tension: Increasing the tension of the string will increase the frequency, making the sound higher in pitch. Similarly, decreasing the tension will lower the frequency, resulting in a lower-pitched sound.
The combined effect of changing both length and tension will depend on the relative changes made. If you increase the length while simultaneously increasing the tension, the overall effect on pitch may be minimal, as the opposing effects of length and tension balance each other out. However, if you increase the length while decreasing the tension, or vice versa, the resulting pitch change will be more significant.
In summary, changing the length and tension of a string at the same time will alter the sound produced, resulting in a different pitch. The specific change in pitch depends on the direction and magnitude of the changes made to both factors.