The tones are heard as two separate smooth tones for frequency differences above about 15 Hz and a rough sounding fused tone for greater frequency differences.  b. Beats are heard when the frequency difference is less than about 12.5 Hz c. Beats are heard when the frequency difference is greater than about 12.5 Hz d.   The tones are heard as a rough sounding fused tone for frequency differences above about 15 Hz and two separate smooth tones for greater frequency differences.  for greater frequency differences.

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