Can u answer these

1. If sound travels at 345 m/s in air at room temperature, calculate the wavelength in air for the following frequencies: (a) 27.5 Hz, the lowest note on a piano. (b) 4186 Hz, the highest note on a piano. (c) 20 kHz, a frequency that most humans can't hear but dogs can. 2. A man next to a road is playing a 440 Hz (The A above middle C) note on a trumpet. A person in a car on the road approaches the trumpet player at 26.2 m/s. Calculate the apparent frequency the person in the car hears as they approach the trumpeter, and after they pass the trumpeter. Be sure to do both parts, approaching and heading away. Consider whether the source or the observer is moving, and use the appropriate formula