Lowest Frequency of Human Sound Hearing
The range of frequencies humans can typically hear is approximately 20 Hertz ($Hz$) to 20,000 Hertz ($Hz$). This range can vary slightly between individuals and tends to decrease with age, especially at the higher end.
The question asks for the lowest frequency of sound that can be heard by human beings. Based on the standard audibility range:
- Frequencies below 20 $Hz$ are known as infrasound and are generally not perceived by the human ear.
- Frequencies within the range of 20 $Hz$ to 20,000 $Hz$ are audible.
- The lowest threshold in this range is 20 $Hz$.
Comparing this to the given options:
- 50 $Hz$ is audible.
- 500 $Hz$ is audible.
- 20 $Hz$ is the lowest audible frequency.
- 10 $Hz$ is typically below the human hearing threshold.
Therefore, the lowest frequency of sound that can be heard by human beings is 20 $Hz$.
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