For example, of the two words lion and lioness, lion is unmarked for gender (it can denote either a male or female) whereas lioness is marked, since it denotes only females. b. Explicitly characterized by or having a particular linguistic feature.
20 Hertz to 20,000 Hertz is the frequency response range that a human can hear. So in answer to your question 20 Hertz would be the lowest pitch a human can hear.
Asked by: Janine Kay, by email. Humans can hear frequencies up to about 20kHz, whereas dogs hear up to 45kHz. Almost all mammals have much better high-frequency hearing than other vertebrates - fish, amphibians and reptiles only hear up to about 5kHz, and birds up to 8-12kHz.