Complete the sentences - AQA - GCSE Physics - Question 7 - 2022 - Paper 1

In a longitudinal wave, the oscillations are parallel to the direction of energy transfer.

The equivalent frequency to 8.0 kHz is 8000 Hz.

To find the period of a sound wave, we use the formula:

$\text{Period} (T) = \frac{1}{\text{frequency}}$

Plugging in the frequency:

$T = \frac{1}{8000} = 0.000125 \text{ s}$

Using the formula for wavelength:

$\text{wavelength} (\lambda) = \frac{\text{speed}}{\text{frequency}}$

Substituting the values:

$\lambda = \frac{330}{6600} = 0.05 \text{ m}$

The equation that links distance, speed, and time is:

$s = vt$

Using the rearranged equation:

$t = \frac{d}{v}$

Substituting the known values:

$t = \frac{13.2}{330} \approx 0.04 \text{ s}$

Loudspeaker B is further from the technician than speaker A, so the sound would take more time to travel (to the technician) and thus, arrives at the technician at the same time.