Compute the wavelength of ultrasonic energy in Lead at 1 MHz.

Master Ultrasonic Testing Level 2 Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Prepare confidently for your certification!

Multiple Choice

Compute the wavelength of ultrasonic energy in Lead at 1 MHz.

Explanation:
Wavelength is found by dividing how fast the wave travels by how often it oscillates: λ = v / f. For ultrasonic energy in lead, the relevant speed is the speed of sound in lead for longitudinal waves, about 2,200 meters per second. At a frequency of 1 MHz (1,000,000 Hz), the wavelength is λ ≈ 2,200 / 1,000,000 = 2.2 x 10^-3 meters, which is 0.22 cm, very close to 0.21 cm. This is why the 0.21 cm option is the best match. The other values would require unrealistically large or small wave speeds in lead at this frequency (for example, 21 cm implies a speed around 2.1 x 10^5 m/s, which is not possible for lead; extremely tiny wavelengths would imply speeds far below any sound speed in solids).

Wavelength is found by dividing how fast the wave travels by how often it oscillates: λ = v / f. For ultrasonic energy in lead, the relevant speed is the speed of sound in lead for longitudinal waves, about 2,200 meters per second. At a frequency of 1 MHz (1,000,000 Hz), the wavelength is λ ≈ 2,200 / 1,000,000 = 2.2 x 10^-3 meters, which is 0.22 cm, very close to 0.21 cm. This is why the 0.21 cm option is the best match.

The other values would require unrealistically large or small wave speeds in lead at this frequency (for example, 21 cm implies a speed around 2.1 x 10^5 m/s, which is not possible for lead; extremely tiny wavelengths would imply speeds far below any sound speed in solids).

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