Which pairing is correct?

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Multiple Choice

Which pairing is correct?

Explanation:
Frequency is how often something happens per unit time, and its standard unit is hertz (cycles per second). Wavelength, while related, is a length and is measured in meters, not volts—volts measure electric potential. Sound power is the total energy emitted per unit time and is measured in watts; watts per square meter would be a measure of sound intensity (power per area), not the basic quantity. Pressure level is expressed in decibels, while Newtons measure force, not a pressure level. Because frequency correctly pairs with its unit, Hertz, this is the matching that fits standard units.

Frequency is how often something happens per unit time, and its standard unit is hertz (cycles per second). Wavelength, while related, is a length and is measured in meters, not volts—volts measure electric potential. Sound power is the total energy emitted per unit time and is measured in watts; watts per square meter would be a measure of sound intensity (power per area), not the basic quantity. Pressure level is expressed in decibels, while Newtons measure force, not a pressure level. Because frequency correctly pairs with its unit, Hertz, this is the matching that fits standard units.

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