Question

A scientist wants to measure the thickness of an aeroplane wing using ultrasound.

She has an electronic source and timer which generates a sound wave of wavelength 20 cm and frequency 29000 Hz
She places the device on the top surface of the wing. It takes 0.32 ms for the sound wave to travel to the bottom of the wing and reflect back to the receiver.

Calculate the thickness of the wing to two significant figures.

Answer 1

High pitch means small wavelength, and the size of a musical instrument is directly related to the wavelengths of sound it produces. So a small instrument creates short-wavelength sounds. Similar arguments hold that a large instrument creates long-wavelength sounds.

Step-by-step explanation: