Question

What are the loudnesses in phons of sounds having frequencies of 200, 1000, 5000, and 10,000 Hz, if they are all at the same 60.0-dB sound intensity level? (b) If they are all at 110 dB? (c) If they are all at 20.0 dB?

a) (a) 60 phons, 60 phons, 60 phons, 60 phons; (b) 110 phons, 110 phons, 110 phons, 110 phons; (c) 20 phons, 20 phons, 20 phons, 20 phons
b) (a) 40 phons, 40 phons, 40 phons, 40 phons; (b) 70 phons, 70 phons, 70 phons, 70 phons; (c) 10 phons, 10 phons, 10 phons, 10 phons
c) (a) 80 phons, 80 phons, 80 phons, 80 phons; (b) 120 phons, 120 phons, 120 phons, 120 phons; (c) 30 phons, 30 phons, 30 phons, 30 phons
d) (a) 60 phons, 60 phons, 60 phons, 60 phons; (b) 100 phons, 100 phons, 100 phons, 100 phons; (c) 50 phons, 50 phons, 50 phons, 50 phons

Answer 1

For the same sound intensity level, the loudness in phons remains the same regardless of frequency. At 60 dB, the loudness of sounds with frequencies 200 Hz, 1000 Hz, 5000 Hz, and 10000 Hz is 60 phons. At 110 dB, the loudness is 110 phons, and at 20 dB, the loudness is 20 phons.

Step-by-step explanation:

(a) Loudness in phons:

All sounds with the same 60.0 dB sound intensity level will have the same loudness in phons regardless of their frequency. Therefore, for all frequencies - 200 Hz, 1000 Hz, 5000 Hz, and 10000 Hz - the loudness will be 60 phons.

(b) Loudness in phons:

All sounds with the same 110 dB sound intensity level will have the same loudness in phons regardless of their frequency. Therefore, for all frequencies - 200 Hz, 1000 Hz, 5000 Hz, and 10000 Hz - the loudness will be 110 phons.

(c) Loudness in phons:

All sounds with the same 20.0 dB sound intensity level will have the same loudness in phons regardless of their frequency. Therefore, for all frequencies - 200 Hz, 1000 Hz, 5000 Hz, and 10000 Hz - the loudness will be 20 phons.