Determine the wavelength of the ultrasonic wave of frequency 4.2 MHz.The speed of ultrasonic wave is 1.4km/s

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Solution

frequency = 4.2 MHz = 4.2 × 1000000 Hz

speed = 1.4 km/s = 1.4 × 1000 m/s

$w a v e l e n g t h = \frac{s p e e d}{f r e q u e n c y} = \frac{1.4 \times 1000}{4.2 \times 1000000} = 0.33 \times 1000 = 0.33 m m$

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Determine the wavelength of the ultrasonic wave of frequency 4.2 MHz.The speed of ultrasonic wave is 1.4km/s

frequency = 4.2 MHz = 4.2 × 1000000 Hz speed = 1.4 km/s = 1.4 ×​ 1000 m/s wavelength = speedfrequency = 1.4 × 10004.2 ×1000000 =0.33 × 1000 = 0.33 mm

frequency = 4.2 MHz = 4.2 × 1000000 Hz

speed = 1.4 km/s = 1.4 × 1000 m/s

$w a v e l e n g t h = \frac{s p e e d}{f r e q u e n c y} = \frac{1.4 \times 1000}{4.2 \times 1000000} = 0.33 \times 1000 = 0.33 m m$