What does an audiometer measure?

Correct answers: (d) Sound intensity or (e) None of the above/More than one of the above

Explanation

An audiometer tests hearing: it plays tones of different frequencies and loudness, and finds the faintest sound, in decibels, that a person can hear.

So it works with sound intensity, but compares it with normal hearing rather than measuring an outside sound. Many keys give (d); the book gives (e).

Many keys give (d) Sound intensity; the book gives (e), since an audiometer tests hearing rather than measuring an outside sound. Both are accepted here.