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Physics, 10.12.2019 05:31 littleprinces

Two guitars are playing together producing a beat frequency. the first guitar is playing at a frequency of 867 hz and the beat is produced every 0.04 seconds. what are some possible frequencies the other guitar could be playing to make this beat?

875 hz or 860 hz
904 hz or 830 hz
878 hz or 856 hz
892 hz or 842 hz

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