TUTORIAL Questions 550-610

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550. What must be the intensity level of a 100 Hz pure tone so that it has a loudness level of 10 phons? (Another way to ask this is: What must be the intensity level of a 100 Hz tone in order for it to sound as loud as a 1000 Hz tone played at 10 dB?)

a) 10 dB
b) 25 dB
c) 45 dB
d) 60 dB

Fundamentals of Sound reference: Sec. 11-I.

560. What is perceived as louder, a 100 Hz tone played at 60 dB or a 10,000 Hz tone played at 60 dB?

a) the 100 Hz tone at 60 dB
b) the 10,000 Hz tone at 60 dB.

Fundamentals of Sound reference: Sec. 11-I.

570. What must be the intensity level of a 500 Hz tone in order for it to be perceived at the same loudness as a 10,000 Hz tone played at 90 dB?

a) 20 dB
b) 40 dB
c) 60 dB
d) 80 dB
e) 100 dB

Fundamentals of Sound reference: Sec. 11-I.

600. Three pure tones, each having an intensity of 85 dB, are played together. The total intensity of the combined sounds is closest to

a) 85 dB
b) 88 dB
c) 90 dB
d) 94 dB
e) 255 dB

Fundamentals of Sound reference: Sec. 11-K.

610. Three pure tones are played together. The intensity level of each tone in dB is as follows: Tone 1, 67 dB; Tone 2, 43 dB; Tone 3, 50 dB. Without doing any math, give an estimate of the intensity of the combined sound in dB?

a) 150 dB
b) 67 dB
c) 70 dB
d) Can't be done without the math

Fundamentals of Sound reference: Sec. 11-K.

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