Which frequency range is considered inaudible to rodents?

Rodents are known to have a hearing range significantly higher than that of humans. They can typically hear sounds up to about 90 kHz, while humans can only hear up to about 20 kHz. Frequencies below their audible range are generally referred to as inaudible.

In terms of the specific frequencies provided, 450 Hertz is indeed within the auditory range of rodents, making it audible to them. This is important to consider, as sounds that fall within their hearing capabilities might affect their behavior and stress levels in laboratory settings.

The correct answer indicates that a specific frequency is considered inaudible to rodents, affirming the fact that the chosen frequency is specifically identified as falling below their minimum detectable range. For rodents, lower frequencies than those mentioned in the choices would typically be inaudible, further emphasizing the need to understand sound frequencies in the context of animal welfare in research environments.