As you may already know, the SI unit for frequency is Hertz (Hz); an event that repeats once per second has a frequency of 1 Hz. According to most sources, the human hearing (frequency) range is between 20 Hz and 20,000 Hz (bats can hear up to 100,000 Hz!).
Note: Some jurisdictions have laws requiring passengers on bicycles to be at least one year old. Usually by age 12 months parents can start checking with the child's physician to see if they have the neck development to safely go for a bike ride.elevance. Rating Newest Oldest. Best Answer: Obviously a child can't be on a bike until they can safely wear a helmet. http://www.helmets.org/little1s.htm Nobody we have met in the injury prevention field recommends taking an infant of less than 12 months in a bicycle child seat, trailer, sidecar or any other carrier.
After much debate, we tried a first ride with Luke in his bike trailer when he was 7 weeks old, with the infant sling (not officially recommended for cycling). We decided to do this based on two main factors: 1  Luke is very big and strong for his age.ut then, they recommend thisâ¦. If you can find one that accommodates your weight and size, ride in a trailer yourself for at least 10 miles, at the speed you expect to travel. At least put a jar of milk in a trailer and ride as you will with the baby, checking the foam level when you stop. We find this ridiculous.