Understanding the Beat Phenomenon: How Equal Amplitudes Create Harmonious Tones

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When two sinusoidal tones of equal amplitude at 439 Hz and 443 Hz are played together, a phenomenon known as "beats" occurs, characterized by a periodic variation in loudness perceived by the listener. This effect arises because the frequencies are close enough that their interference creates a fluctuating sound intensity. Equal amplitudes are crucial for producing clear beats, as significant differences in amplitude would diminish the perceived effect. The discussion also distinguishes between beats, which require closely spaced frequencies, and the "missing fundamental" effect, which involves harmonically related frequencies. Understanding these concepts enhances the appreciation of sound wave interactions in music and acoustics.
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I am confused by this:

Two sinusoidal tones of equal amplitude and with frequencies of 439 and 443 Hz are sounded simultaneously.

Name and describe (qualitavitively and quantitatively) what you hear.
Why is it important that the two waves have equal amplitudes for this effect to occur
 
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