The penetrating power of ultrasound waves and audible sounds are denoted by $P_{1}$ and $P_{2}$ Respectively. Which of the following is correct?

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P_{1} > P_{2}

P_{1} < P_{2}

P_{1} = P_{2}

None of the above

answer is A.

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Detailed Solution

P_{1} > P_{2}

is the correct statement.
The ultrasonic wave’s penetrating power is very high compared to sonic or audible sound. Due to its high frequency, ultrasound has greater energy than audible sound; therefore, it has greater power. Because the penetrating power also depends upon the energy of sound. This quality of the ultrasonic sound is used to detect defects in any metallic structure. Ultrasonic waves are allowed to go through the metal. It reflects back to the source if there is any defect or disintegration in the metallic object.

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