A) ध्वनी लहरी अडथळ्यांच्या मागे विवर्तन होते
B) निश्चित टोकावरून परावर्तित होणारी ध्वनी लहरी आपाती लहरीशी व्यतिकरण करते
C) हवेच्या रेणूंची अनुदैर्ध्य हालचाल दाबाचे चढ-उतार निर्माण करते
D) ध्वनी लहरीचा वेग माध्यमातून प्रवास करताना बदलतो
योग्य उत्तर: C
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