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The SI unit of frequency, equal to one cycle per second.
- ‘Different frequencies, measured in hertz, or cycles per second, indicate different levels and types of activities.’
- ‘A gravity wave with a frequency of 1,000 hertz, for example, spans nearly 200 miles from peak to peak.’
- ‘‘We shook the top with a motor to produce a displacement of about 1 millimeter at 10 hertz,’ says Giazotto.’
- ‘When he measured the infrasound in the laboratory, the showing was 18.98 hertz - the exact frequency at which a human eyeball starts resonating.’
- ‘At the moment, for example, the two neutron stars in the Hulse-Taylor binary are emitting gravity waves at a frequency of 10-4 hertz as they circle one another every eight hours.’
- ‘Frequencies of hundreds of megahertz were selected with a resolution of just a few hertz, while the magnetic field had to be homogeneous to within one part in a billion.’
- ‘And he actually employed a 27 hertz frequency through the first part of the film to induce unease.’
- ‘I compose on synths, I perform with them; sometimes I watch a sunset with an 80-hertz sawtooth wave humming in the background.’
- ‘Most pneumatic isolators operate effectively above several hertz, but at their natural frequency they actually provide some amplification.’
- ‘In most systems, the fundamental frequency is 60 hertz.’
- ‘The other instrument is sensitive to even lower frequencies, ranging from less than 0.1 to 400 hertz.’
- ‘But the only common instances of animal infrasound - inaudibly low frequencies - were the 20 hertz songs of fin and blue whales, and these proved fiendishly hard to investigate.’
- ‘It now occurs to me that the best analogy for Google hits as a measurement term is not hertz or joules or pascals, but degrees Celsius.’
- ‘We see frequencies of hundreds of hertz, or hundreds of revolutions of the disk per second.’
- ‘The answer, Zuckerwar explains, is that each one generates silent infrasound - long sound waves at a frequency below 20 hertz.’
- ‘At random times the program changed the dot's frequency up or down by up to a few tenths of a hertz.’
- ‘It was 1,660 hertz (cycles per second), in the range of frequencies expected to emanate from an exploding star.’
- ‘The sounds and charges transmit in the low frequency range of 20 hertz, which is barely audible to the human ear.’
- ‘The selection of the frequency shift is 100,000,000 hertz.’
- ‘The praying mantis' ultrasonic hearing picks up frequencies above 20,000 hertz - just beyond the range of humans - through a single ear located in the center of its chest.’
Late 19th century: named after H. R. Hertz (see Hertz, Heinrich Rudolf).
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