pulse was selected for underwater locator beacons on black boxes because there is nothing else in the sea that would naturally make that sound, said William Waldock, an expert on search and rescue who teaches accident investigation at Embry-Riddle Aeronautical University in Prescott, Arizona.
Their results showed that frog nerve cells are sensitive to frequencies as high as 34 kilohertz
RF ranges from 3 kilohertz
to 300,000 megahertz while LE ranges from 30 to 300 kilohertz
Bats' ultrasonic cries span a frequency between 20 and 100 kilohertz
, compared with 1 kHz for the human voice.
By comparison, a typical AM radio station operates in the kilohertz
(kHz) range, or thousands of cycles per second.
Capable of imparting a force up to 20kN, this equipment extends the frequency range to many kilohertz
and can be driven by either sinusoidal or random signals in order to conform to today's most widely used test standards.
For example, AM radio uses frequencies from 535 to 1605 kilohertz
, but frequencies from 1800 to 29,700 kilohertz
are available for amateur use.
The device logged swimming speed, depth, temperature, and acoustic data below 1 kilohertz
from every fourth dive as the seal swam back to its rookery.
Frequencies on an AM-radio station range from 520 to 1,620 kilohertz
(formerly called kilocycles).
I picked it up at 11,750 kilohertz
and understood about a quarter of it as the phrases hurried by: "Germani limitem inter ipsos .
The clicks were between two to four kilohertz
in frequency, with some additional strength around 10 kilohertz
The JenLas femto 16 features a pulse energy up to 80 microjoules, a free and quickly adjustable pulse repetition rate from 100 to 510 kilohertz
, single shot ability, an internal SHG option (THG on request) and reliable operation at up to 35C ambient temperature.