The beat frequency is produced by the difference between two frequencies. To find the lowest beat frequency from the given combinations, we calculate the differences:
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10 Hz and 15 Hz:
- Beat frequency = |15 Hz - 10 Hz| = 5 Hz
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500 Hz and 501 Hz:
- Beat frequency = |501 Hz - 500 Hz| = 1 Hz
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10 Hz and 20 Hz:
- Beat frequency = |20 Hz - 10 Hz| = 10 Hz
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500 Hz and 600 Hz:
- Beat frequency = |600 Hz - 500 Hz| = 100 Hz
The combination that produces the lowest beat frequency is 500 Hz and 501 Hz, which results in a beat frequency of 1 Hz.