The speed of highly penetrating ultrasonic waves is :ALower than those of audible sound wavesBHigher than those of audible sound wavesCMuch higher than those of audible sound wavesDSame as those of audible sound waves

To determine the speed of highly penetrating ultrasonic waves, we can compare it to the speed of audible sound waves.

Step 1: Understand the question The question is asking about the speed of highly penetrating ultrasonic waves in relation to audible sound waves.

Step 2: Analyze the options The options provided are: A) Lower than those of audible sound waves B) Higher than those of audible sound waves C) Much higher than those of audible sound waves D) Same as those of audible sound waves

Step 3: Evaluate the options To determine the correct answer, we need to consider the properties of ultrasonic waves and audible sound waves. Ultrasonic waves have a higher frequency than audible sound waves, which means they have a shorter wavelength. Generally, waves with shorter wavelengths tend to travel faster.

Step 4: Determine the correct answer Based on our understanding of the properties of ultrasonic waves and audible sound waves, we can conclude that the correct answer is option C) Much higher than those of audible sound waves.

Step 5: Provide the answer The speed of highly penetrating ultrasonic waves is much higher than that of audible sound waves.