3-4: 4 SEE ANSWER

Answer: A (the same loudness)

You can solve this problem using the "Loudness Level" chart in this unit. You can estimate that 90 db at 2000 Hz is about 52 phons (by looking at the y-axis amount at this point). You can estimate that the 100 db at 1000 Hz is about 52 phons (by looking at the y-axis at this point). Since the same loudness level is produced by both tones, these tones would have the same loudness.

1. REDIRECT 3-4 Loudness Level