Because of the reflection of sound waves reflected back through the musical instruments

Difference in Sound between Flute and Harmonica:

Introduction:
When comparing the sounds produced by a flute and a harmonica, there are several factors that contribute to their differences. These factors include the wavelength, speed of sound in air, pitch, and amplitude. However, the main reason for the difference in sound between these two instruments is the pitch.

Explanation:

1. Wavelength:
- The wavelength of a sound wave is the distance between two consecutive points in the wave that are in phase.
- In the case of a flute and a harmonica, the wavelengths of the sound produced may be different due to the different sizes and structures of the instruments.
- However, the difference in wavelength does not significantly affect the difference in sound between the two instruments.

2. Speed of Sound in Air:
- The speed of sound in air is the speed at which sound waves propagate through the medium of air.
- The speed of sound in air is approximately the same for both flute and harmonica.
- Therefore, the difference in sound between the two instruments is not primarily due to the difference in the speed of sound in air.

3. Pitch:
- The pitch of a sound refers to the perceived frequency of the sound wave.
- The flute and harmonica produce sounds of different pitches.
- The pitch of a sound is determined by the frequency of the sound wave, which is the number of vibrations per second.
- The flute produces a higher pitch sound compared to the harmonica because it has a higher frequency of vibrations.
- This difference in pitch is due to the difference in the design and construction of the instruments.

4. Amplitude:
- The amplitude of a sound wave refers to the magnitude or strength of the wave.
- The amplitude determines the volume or loudness of the sound.
- While there may be differences in the amplitude of the sound produced by a flute and a harmonica, it is not the primary factor that contributes to the difference in sound between these two instruments.

Conclusion:
In conclusion, the main reason for the difference in sound between a flute and a harmonica is the difference in pitch. The flute produces a higher pitch sound compared to the harmonica due to the difference in the frequency of vibrations. The other factors such as wavelength, speed of sound in air, and amplitude may contribute to some extent, but they are not the primary factors that differentiate the sounds produced by these instruments.