Assignment 40. Use the simulation: https://ophysics.com/waves1 1.html a. Observe the Doppler Effect for a sound source moving slower than the speed of sound. What happens to the length of the sound wave for the front observer? How does this affect the perceived frequency? b. Observe the Doppler Effect for a sound source moving slower than the speed of sound. What happens to the length of the sound wave for the back observer? How does this affect the perceived frequency? c. Observe the Doppler Effect for a sound source moving at the speed of sound. What would you experience as an observer if an object travelling at the speed of sound approaches? Explain