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Question: Using loudness contours ISO 226, 2003), which of the above two frequencies is loudness growth greater for a normal hearing listener with thresholds of 0 dB HL at audiometric frequencies: 50 dB SPL tone at 125 Hz or a 40 dB SPL tone at 1000 Hz? Explain.
The loudness growth is greater for the 50 dB SPL tone at 125 Hz than for the 40 dB SPL tone at 1000 Hz. This is because the loudness of a sound is related to its frequency, and the lower the frequency of a sound, the higher its loudness. As a general rule, the loudness of a sound increases 2 dB per octave as its frequency decreases, making 125 Hz much louder than 1000 Hz. Additionally, the thresholds of 0 dB HL at audiometric frequencies are lower for lower frequencies, meaning that sound at or below 125 Hz would be heard by the listener more easily than sound at or above 1000 Hz.
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