a) Two wave pulses that are out of phase, such as the ones shown here, come together. Will the amplitude during interference be equal to the sum of the amplitudes of the two waves? Why or why not? (2 marks) b) A horn emitting a frequency of 1.23 kHz is moving away from a person with a velocity of 82.1 m/s. What is the frequency observed by the person? The speed of sound in air is 346 m/s. (2 marks) c) "Damping is sometimes desirable." Do you agree or disagree with this statement? Explain. (1 mark)