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Wavelength and frequency

a. What is the difference between wavelength and frequency?
b. If sound travels through steel at 5000 m/s and the sound frequency being transmitted is 400 Hz, what is the wavelength (meters) of the sound?
c. Describe the concept of decibels and what they represent.
d. Search the Internet for a hand-held sound level meter. Briefly present its specifications and cost.
e. List four noise control techniques.
f. Describe methods for reducing transportation noise.