10. What is the loudness in phons of a 1000-Hz sour that has an intensity level of 80 dB?

The loudness in phons of a 1000-Hz sound that has an intensity level of 80 dB is 80 phons. The phon is a unit of loudness level, and it is equal to the intensity level in decibels (dB) for a frequency of 1000 Hz. Therefore, if a sound has an intensity level of 80 dB at 1000 Hz, its loudness in phons is also 80.