Explain the relationship between the frequency of a sound wave and the pitch of the sound that is heard.
A marine foghorn emits sound waves with a frequency of 125 Hz125\text{ Hz}125 Hz.
The speed of sound in the surrounding air is initially 335 m/s335\text{ m/s}335 m/s.
State the equation linking wave speed, frequency and wavelength.
Calculate the wavelength of these sound waves.
A student investigates how the speed of sound in air varies with temperature. The student's results are shown on the graph below.
Draw a straight line of best fit on the graph.
Use the graph to find the speed of sound when the air temperature is 30∘C30^\circ\text{C}30∘C.
The air temperature increases while the foghorn continues to emit sound waves with a constant frequency of 125 Hz125\text{ Hz}125 Hz.
Explain how this increase in temperature affects the wavelength of the sound waves.
