1. The source vibration for a continuous wave train has the properties as shown by the graph. If the speed of the wave produced is 712 km/h, determine the wavelength.

2. When the temperature of the air is 23.0 C, the speed of sound is 344.8 m/s. If it takes a sound wave 1.80 seconds to hit a distant building and return, then how far away is the building?

3. A closed air column resonates at the third harmonic when the source frequency is 625 Hz. What is the next frequency that it resonates at?

4. A closed air column has a length of 36.0 cm. If the speed of sound is 343.6 m/s, then what is the lowest frequency to resonate the air column?

5. An ambulance siren has an average frequency of 865 Hz. If you are in a car and driving beside the ambulance at the same speed, then would the apparent frequency be lower, higher, or the same as the actual frequency? Explain

6. A train is moving towards a stationary observer at a speed of 60.0 km/h. If the apparent frequency of the train whistle is 11.0 kHz and the speed of sound is 330 m/s, then determine the actual frequency of the train whistle. 7. A car makes a noise with a frequency of 460 Hz. The speed of the sound wave produced is 343 m/s. If the apparent frequency heard by the stationary observer is 425 Hz, then:

a) is it moving towards or away from the observer?

b) how fast is the car moving?