Discussion
Choose the correct statement with respect to sense of hearing :
(1) Pitch and loudness are the same.
(2) Frequency is measured in hertz.
(3) Intensity corresponds to loudness exactly.
(4) Amplitude is measured in decibels.
Answer: A
The correct statements are (2) and (4) only.
Frequency, the number of sound-wave cycles per second, is measured in hertz (2), and the amplitude of a sound wave is expressed as a sound pressure level in decibels (4).
Statement (1) is wrong: pitch is the perceived quality that depends mainly on frequency, while loudness depends mainly on amplitude. Statement (3) is wrong because the correspondence is not exact: loudness also depends on frequency, so two tones of the same intensity but different frequencies can sound unequally loud, as the equal-loudness contours show. Any option including (1) or (3) is therefore wrong.
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