25,000 Hz is far above what headphones, speakers and sound cards can reproduce (most top out at 20–24 kHz), so there is no tone to play here.
What does 25,000 Hz sound like?
25,000 Hz is a ultrasound frequency. It is ultrasound: above the upper limit of human hearing, although many animals – dogs, cats, bats, dolphins and rodents – can hear it.
A 25,000 Hz sound wave completes 25,000 cycles every second, so one cycle lasts 40 µs. In air at 20 °C, where sound travels at about 343 m/s, each wave is 1.4 cm (0.54 in) long; in water it stretches to 5.9 cm because sound moves about 4.3 times faster there.
Wavelength of 25,000 Hz in different materials
| Medium | Speed of sound | Wavelength |
|---|---|---|
| Air (20 °C) | 343 m/s | 1.4 cm |
| Fresh water | 1,481 m/s | 5.9 cm |
| Seawater | 1,500 m/s | 6.0 cm |
| Helium | 1,007 m/s | 4.0 cm |
| Steel | 5,960 m/s | 23.8 cm |
| Glass | 5,640 m/s | 22.6 cm |
Harmonics and octaves
Real instruments playing 25,000 Hz also produce harmonics at whole-number multiples of the fundamental. Their relative strength gives each instrument its timbre.
| Harmonic | Frequency | Nearest note |
|---|---|---|
| 1× (fundamental) | 25 kHz | ultrasonic |
| 2× | 50 kHz | ultrasonic |
| 3× | 75 kHz | ultrasonic |
| 4× | 100 kHz | ultrasonic |
| 5× | 125 kHz | ultrasonic |
| 6× | 150 kHz | ultrasonic |
| 7× | 175 kHz | ultrasonic |
| 8× | 200 kHz | ultrasonic |
Which animals can hear 25,000 Hz?
Can hear it
Dogs, Cats, Horses, Cows, Sheep, Pigs, Goats, Rabbits, Rats, Mice, Gerbils, Guinea pigs, Hedgehogs, Raccoons, Ferrets, Opossums, Bats, Beluga whales, Bottlenose dolphins, Greater wax moths
Cannot hear it
Humans, Chinchillas, Elephants, Chickens, Canaries, Budgerigars (parakeets), Cockatiels, Owls, Bullfrogs, Tree frogs, Goldfish, Catfish, Tuna
Frequently asked questions
What does 25,000 Hz sound like?
It is ultrasound: above the upper limit of human hearing, although many animals – dogs, cats, bats, dolphins and rodents – can hear it.
Can humans hear 25,000 Hz?
No. 25,000 Hz is above the ~20 kHz upper limit of human hearing.
What musical note is 25,000 Hz?
25,000 Hz is outside the range normally used for musical notes.
What is the wavelength of 25,000 Hz?
About 1.4 cm in air at 20 °C and 5.9 cm in water.
Can dogs hear 25,000 Hz?
Yes – dogs hear roughly 67 Hz to 45,000 Hz.