Question one In an experiment to determine the speed of a sound, learners are given a siren that sounds a single note of
frequency 426Hz which is attached to a remote controlled car and moves it at a constant speed past a
stationary tape recorder which is mounted in the middle of a runaway. The learners observed that the pitch
of the sound from the siren as it moved towards the tape recorder was higher compare to when the siren
moved away
A. Name and define the effect which explain this observation
B. Mention three applications of the named effect
C. In one of the trials, the speed of the remote-controlled car was noted as 31km/hr, two notes from
the siren were recorded, one with a frequency of 437Hz and the other note with a frequency lower
than 426Hz. Determine the speed of sound in air​