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The correct answer is decibel. The decibel is a logarithmic unit that quantifies ratios of physical quantities, often used to measure sound intensity. It allows for a convenient way to express the wide range of sound intensities perceived by the human ear. For example, normal conversation is around 60 decibels, while a rock concert may reach levels of 110 decibels.

The other units listed do not pertain to sound measurement. A cyclotron refers to a type of particle accelerator, corpuscle relates to cells or small particles in biology or physics, and a cyclone usually refers to a weather phenomenon associated with strong winds and rain. Each of these has its specific application in different scientific fields but does not apply to measuring sound.