Round 2: Tossup 1

This unit is the most common unit used to express the front-to-back ratio of an antenna. A meteorological quantity called this unit relative to Z is a normalized expression for the equivalent reflectivity of a hydrometeor. The steepness of a filter’s transfer function is written as the change in this unit per decade or octave, which (10[1])is a quantity called the roll-off. The frequency at which gain drops off by approximately 3 of this unit determines the cutoff frequency. (10[2])In its most common application, a reference pressure equal to 20 micropascals defines a value of 0 for this unit. This (10[1])unit is defined so that multiplying intensity by a factor of 10 corresponds (10[1])to an increase by 10 of this unit. (10[3])For 10 points, name this unit that defines a logarithmic scale of sound intensity. ■END■ (10[1])

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