Which logarithmic ratio of analog signal strengths is named after Alexander Graham Bell?

The decibel is a logarithmic unit used to measure the ratio of two values, commonly in terms of power or intensity of sound. Named after Alexander Graham Bell, the decibel is specifically defined as one-tenth of a bel. This unit simplifies the expression of large ratios, particularly in fields like telecommunications and audio engineering, where it is vital to convey the strength of signals, gain, and attenuation in a manageable format.

In terms of usage, the decibel allows for easier calculation and communication about signal strength. For instance, when comparing two signals or the power level from a device, the decibel scale condenses large numerical differences into a much smaller range, facilitating quick understanding and interpretation.

The other options relate to different concepts: 'bel' is the broader unit from which decibels are derived, while 'hertz' refers to frequency (the number of cycles per second of a periodic phenomenon), and 'bandwidth' refers to the range of frequencies within a given band in a communications system. Understanding the significance of the decibel in signal processing highlights its practical application in various technical environments, especially those involving sound and electric signals.