10. Two tones, each of 50 Hz, have intensity levels of 50 dB and 120 dB, respectively. What is the loudness level of each in phons? (Refer to the equal-loudness curves above.)

Answer: 15 phons and 110 phons.

11. Three tones of 50 Hz, 1,000 Hz, and 5,000 Hz each have a loudness level of 60 phons. What is the intensity level in dB of each?

Answer: 78 dB, 60 dB. and 53 dB.

12. A 100-Hz tone of intensity level 50 dB is about as loud as a 1000-Hz tone of intensity level 40 dB. (You can see this relationship by examining the equal-loudness curves above). What is the ratio of the intensity of the 100-Hz tone to that of the 1,000-Hz tone?
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