We can calculate the wavelength of sound waves that we can hear using the formula wavelength = velocity / frequency. In air sound travels at about 340 meters per second (the precise value depends on temperature, humidity, and pressure).
The average salary for certified nursing assistant jobs in Raleigh, NC is $37,000. Average certified nursing assistant salaries can vary greatly due to company, location, industry, experience and benefits.
According to a recent survey conducted by the US Bureau of Labor Statistics, the mean annual pay of a certified nursing assistant in the state of North Carolina was $22,860 and per hour salary was $10.99 in May 2013. NC employed 50,990 nurse aides in the same year and employment per 1000 jobs was 12.92. The figures in indeed.com indicate that the average salary of a CNA was $23,000 as of Jan 2015. It was 5% lower than the average income for job postings throughout the nation.