1. What is the wavelength of an electromagnetic wave with frequency 65.5 MHz?
2. Find the speed of sound in m/s at 85°C at 1 atm pressure in dry air.
3. Find the speed of sound in m/s at –35°C at 1 atm pressure in dry air.
4. How long will it take a sound wave to travel through 1450 m of water at 25°C?
5. A sound wave is transmitted through water from one ship, is reflected off another ship 22 km away, and returns to the sonar receiver on the first ship. What is the round-trip transit time for the sound wave if the water temperature is 23°C?
6. A train traveling at a speed of 95 mi/h approaches an observer at a station and sounds a 525-Hz whistle. What frequency will be heard by the observer? Assume that the sound velocity in air is 1090 ft/s.