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At an open-air rock concert you are standing directly in front of a speaker. You hear...

At an open-air rock concert you are standing directly in front of a speaker. You hear the highfrequency sounds of a female vocalist as well as the low-frequency sounds of the rhythmic bass. As you walk to one side of the speaker, the sounds of the vocalist _________, and those of the rhythmic bass _________. (a) drop off noticeably; also drop off noticeably (b) drop off only slightly; drop off noticeably (c) drop off only slightly; also drop off only slightly (d) drop off noticeably; drop off only slightly (PLEASE EXPLAIN WHY AS WELL)

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