The speed of a longitudinal wave will not be affected by the temperature of its surrounding. Base on the formula for the wave speed (applicable on longitudinal wave), wave speed ( speed in m.s 2) is equal to the distance of a wave (wavelenth in meter) travel over a unit of time (seconds) or wave speed is equal to distance of a wave times the frequency (hertz), temperature is not included in calculating the wave speed.
In the given problem, Farah is doing an experiment that involves calculating the speed of a longitudinal wave
For example, Sound wave is a longitudinal wave. It travels faster in solid than liquid and gas as the solid is more denser.
The speed of the sound increases with the temperature. At higher temperature, the molecules have more kinetic energy. They can vibrate faster. The sound wave can travel faster. The speed of the sound in the room temperature is 346 m/s.
If Farah increases the temperature then the sound wave travels faster.
