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68 TRG-TRC007-EN
Questions for Period 1
1 What unit of measure is used to describe frequency?
2 Define a tone.
3 Sound _______ (power or pressure) is what our ears hear and is influenced
by the surroundings.
Questions for Period 2
4 Which of these two single-number descriptors, A-weighted sound pressure
level or Noise Criteria (NC) rating, is better for describing outdoor sound?
5 Which of the above mentioned descriptors is better for describing sound in
an office space or classroom?
6 What is the NC rating of a space with the following sound-pressure levels?
octave
band
center
frequency
(Hz)
measured
sound pressure
(dB ref 20 µPa)
1 63 48
2 125 47
3 250 45
4 500 39
5 1,000 35
6 2,000 27
7 4,000 19
8 8,000 14
Quiz