An investigator studies how the wavelength of sound waves in ethanol varies with frequency.
The table shows their data.
| Frequency in kHz | 6.0 | 4.8 | 3.6 | 1.8 | 1.2 |
|---|---|---|---|---|---|
| Wavelength in mm | 195 | 255 | 340 | 660 | 1020 |
Plot a graph of the results on the grid.
Draw the curve of best fit.
Use your graph to find the frequency of sound waves that have a wavelength of 500 mm500\text{ mm}500 mm in ethanol.
Describe the relationship between frequency and wavelength shown by the graph.
Suggest how the investigator could improve the reliability of their results.
State the equation linking wave speed, frequency, and wavelength.
Calculate the speed of sound in ethanol for a wavelength of 480 mm480\text{ mm}480 mm and a frequency of 2.5 kHz2.5\text{ kHz}2.5 kHz.
