1. If two identical waves interact constructively, how will this affect the amplitude of the wave? What about the wavelength and frequency? (10 points) 2. You are shouting a message to your friend across a lake. If the lake's temperature is 10 C and the air above it is 16 C, what is going to happen to your sound waves and why is this an inefficient way of delivering a message to your friend, in the context of thermodynamics? (10 points) 3. What is the speed of a wave with a period of 6 seconds and a wavelength of 0.08 cm? (10 points) 4. What is the tension force needed to maintain a wave speed of 2 m/s on a cable of length 40 m and mass of 80 kg? (10 points) 5. If a continuous sound source with a natural frequency of 300 Hz approaches you (you are standing still) at a speed of 20 m/s, what frequency do you observe? Assume the speed of sound is 340 m/s. 10 points)