What is the relationship between the frequency of a sound wave and the pitch of the sound?
A siren emits sound waves with a frequency of 200 Hz200\text{ Hz}200 Hz.
The speed of sound in air is initially 340 m/s340\text{ m/s}340 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 25∘C25^\circ\text{C}25∘C.
The air temperature increases while the siren continues to emit sound waves with a constant frequency of 200 Hz200\text{ Hz}200 Hz.
Explain how this increase in temperature affects the wavelength of the sound waves.
