Ultrasonics are sound waves of frequency

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Q: 66 (UPPSC/2012)
Ultrasonics are sound waves of frequency
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question_subject: 

Science

question_exam: 

UPPSC

stats: 

0,27,4,27,2,1,1

keywords: 

{'ultrasonics': [0, 0, 0, 1], 'sound waves': [0, 0, 2, 9], 'hz': [0, 0, 4, 8], 'frequency': [0, 0, 1, 3]}