Final answer:
Nondestructive testing methods, such as ultrasonic testing, can be used to measure coating thickness. The time recorded using ultrasonic waves can be calculated based on the wavelength and desired thickness of the coating.
Step-by-step explanation:
In the context of coating thickness measurements, nondestructive testing methods can be used. One such method is ultrasonic testing, which involves using an ultrasonic transducer to send sound waves through the coating. These sound waves are reflected by the interface between the coating and the metal pan, and the time it takes for the waves to travel can be measured. By knowing the wavelength of the ultrasonic waves and the thickness of the coating, the time recorded can be calculated.
In the given scenario, the wavelength of the ultrasonic waves in the coating is 0.076 m and the desired thickness of the coating is 1.00 mm. Using the relationship between wavelength (λ), speed (ν), and time (t), which is given by the equation λ = νt, we can rearrange the equation to solve for time: t = λ / ν. Plugging in the values, we get t = 0.076 m / 25,000 Hz = 3.04 x 10^-6 s. So, the time recorded if the coating is the correct thickness should be 3.04 x 10^-6 seconds.