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Direct linkMcCall, Richard P. – Physics Teacher, 2006
Earplugs are sold in most pharmacies. Because I teach at a college of pharmacy, I want my students to understand a particular feature of earplugs called the Noise Reduction Rating, or NRR. The NRR is a rating of the effectiveness of earplugs at decreasing the amount of sound (or noise) entering the ear. Typical values range from 12 dB to 33 dB;…
Descriptors: Pharmacy, Acoustics, Auditory Discrimination, Assistive Technology
