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An ultrasonic wave of frequency 3×10⁵ Hz passes through a medium where sound travels 10 times faster than in air (taking air’s speed as 300 m/s). What is this wave’s approximate wavelength in that medium?

1. An ultrasonic wave of frequency 3×10⁵ Hz passes through a medium where sound travels 10 times faster than in air (taking air’s speed as 300 m/s). What is this wave’s approximate wavelength in that medium?

 

Speed in the medium is 10 × 300 = 3,000 m/s. Wavelength equals speed divided by frequency: 3,000 ÷ (3×10⁵) = 0.01 m, which is 1 cm.

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