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प्रश्न
The speed of highly penetrating ultrasonic waves is :
पर्याय
lower than those of audible sound waves
higher than those of audible sound waves
much higher than those of audible sound waves
same as those of audible sound waves
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उत्तर
The speed of sound wave in air is independent of its frequency.
(d) Same as those of audible sound waves.
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