Question
Ultrasound was used to check for cracks in an aeroplane wing. The ultrasound pulse would be reflected from any cracks and from the end of the wing. The diagram shows the oscilloscope trace produced by the echo . How long was the plane wing? The speed of sound in metal is 5000m/s (Time is measured in miliseconds Remember that I second equals 1000 miliseconds.]
Answer
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Ina
Master · Tutor for 5 years
Answer
(5000 m/s * Time in seconds) / 2. Please provide the Time in milliseconds to calculate the exact length of the plane wing.
Explanation
The oscilloscope trace shows the time taken for the ultrasound pulse to travel to the end of the wing and back. This time is given in milliseconds, so we need to convert it to seconds by multiplying by 0.001. We also know that the speed of sound in metal is 5000 m/s. The distance travelled by the ultrasound pulse can be determined with the formula: Distance = Speed × Time. The product of speed and time gives us the total distance covered by the ultrasound pulse in both directions (to the end of the wing and back). However, the question is asking for the length of the plane wing (one way), so we divide the total distance by 2 to get the answer.