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What does 7,800 Hz sound like?
7,800 Hz is a brilliance (air) frequency. It is a very high, thin, whistling tone. Sensitivity in this region falls with age, so younger listeners hear it much more clearly than older ones.
A 7,800 Hz sound wave completes 7,800 cycles every second, so one cycle lasts 128 µs. In air at 20 °C, where sound travels at about 343 m/s, each wave is 4.4 cm (1.73 in) long; in water it stretches to 19.0 cm because sound moves about 4.3 times faster there.
Musically, 7,800 Hz is 23 cents below B8 (7.902 kHz) in standard A440 tuning. Doubling it to 15,600 Hz raises the pitch by one octave; halving it to 3,900 Hz lowers it by one.
Wavelength of 7,800 Hz in different materials
| Medium | Speed of sound | Wavelength |
|---|---|---|
| Air (20 °C) | 343 m/s | 4.4 cm |
| Fresh water | 1,481 m/s | 19.0 cm |
| Seawater | 1,500 m/s | 19.2 cm |
| Helium | 1,007 m/s | 12.9 cm |
| Steel | 5,960 m/s | 76.4 cm |
| Glass | 5,640 m/s | 72.3 cm |
Harmonics and octaves
Real instruments playing 7,800 Hz also produce harmonics at whole-number multiples of the fundamental. Their relative strength gives each instrument its timbre.
Which animals can hear 7,800 Hz?
Can hear it
Humans, Dogs, Cats, Horses, Cows, Sheep, Pigs, Goats, Rabbits, Rats, Mice, Gerbils, Guinea pigs, Hedgehogs, Raccoons, Ferrets, Opossums, Chinchillas, Bats, Elephants, Beluga whales, Bottlenose dolphins, Canaries, Budgerigars (parakeets), Cockatiels, Owls, Greater wax moths
Frequently asked questions
What does 7,800 Hz sound like?
It is a very high, thin, whistling tone. Sensitivity in this region falls with age, so younger listeners hear it much more clearly than older ones.
Can humans hear 7,800 Hz?
Yes. 7,800 Hz is inside the typical human hearing range of 20 Hz to 20 kHz.
What musical note is 7,800 Hz?
7,800 Hz is 23 cents below B8, which is 7.902 kHz in standard A440 tuning.
What is the wavelength of 7,800 Hz?
About 4.4 cm in air at 20 °C and 19.0 cm in water.
Can dogs hear 7,800 Hz?
Yes – dogs hear roughly 67 Hz to 45,000 Hz.