The human ear is most sensitive to sounds with frequencies between 2 kHz and 4 kHz - Leaving Cert Physics - Question (vi) (vii) (viii) - 2022

To illustrate the first position of resonance in a pipe open at one end:

1. Draw a horizontal line to represent the pipe.
2. Label one end as the open end and the other as the closed end.
3. At the open end, indicate an anti-node (maximum displacement).
4. At the closed end, mark it as a node (minimum displacement).
5. Clearly label both ends in the diagram.

To calculate the speed of the wave, we use the formula:

$v = f imes \\lambda$

where:

• $v$ is the speed of the wave,
• $f$ is the frequency (2800 Hz),
• $\\lambda$ is the wavelength (0.12 m).

Plugging in the values:
$v = 2800 imes 0.12 = 336 \, m/s$

Thus, the speed of the wave is 336 m/s.