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1. Sound A has a frequency of 1000 Hz, while sound B has a frequency of 8000 Hz. Which of these
sounds will have the greater inter-aural time difference?
a. Sound A
b. Sound B
c. Cannot tell from this information
d. They both will have similar inter-aural time difference
2. Beth is standing in the middle of an anechoic chamber, with loudspeakers placed on her left and
right. A 500 Hz sound with an intensity of 60 dB SPL is produced by the loudspeaker on her left.
Which of the following statements is true, assuming that Beth has normal hearing, and is standing
still and looking straight ahead? **
a. The sound will be heard in Beth’s right ear at an intensity around 60 dB SPL at the same time
as in her left ear.
b. The sound will be heard in Beth’s right ear at an intensity around 60 dB SPL after a delay of
about 0.8 ms.
c. The sound will be heard in Beth’s right ear at a much lower intensity at the same time as in
her left ear.
d. The sound will be heard in Beth’s right ear at a much lower intensity after a delay of about
0.8 ms.
ANSWERS
1. Sound A has a frequency of 1000 Hz, while sound B has a frequency of 8000 Hz. Which of these
sounds will have the greater inter-aural time difference?
a. Sound A
b. Sound B
c. Cannot tell from this information
d. They both will have similar inter-aural time difference
2. Beth is standing in the middle of an anechoic chamber, with loudspeakers placed on her left and
right. A 500 Hz sound with an intensity of 60 dB SPL is produced by the loudspeaker on her left.
Which of the following statements is true, assuming that Beth has normal hearing, and is standing
still and looking straight ahead? **
a. The sound will be heard in Beth’s right ear at an intensity around 60 dB SPL at the same time
as in her left ear.
b. The sound will be heard in Beth’s right ear at an intensity around 60 dB SPL after a
delay of about 0.8 ms. (Low frequency has almost no inter-aural intensity difference,
but will still have an inter-aural time difference)
c. The sound will be heard in Beth’s right ear at a much lower intensity at the same time as in
her left ear.
d. The sound will be heard in Beth’s right ear at a much lower intensity after a delay of about
0.8 ms.
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