SOLVED: A guitarist attempts to tune a string on his guitar using a tuning fork that vibrates at 440 Hz After plucking the string and tapping the fork; he hears a beat
Concert pitch - Wikipedia
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432 Hz vs 440 Hz - Which Should I Use to Tune my Instrument? - Roadie Music Blog
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Wittner Tuning Fork 443 Hz – Thomann UK
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Solved When a 440Hz tuning fork (concert A) is struck | Chegg.com