Start with your device volume low. Very low tones may be inaudible on phone or laptop speakers; very high tones can be uncomfortable on headphones.
What does 720 Hz sound like?
720 Hz is a midrange frequency. It is a clear midrange tone, close to where the human ear does most of its work for speech and melody.
A 720 Hz sound wave completes 720 cycles every second, so one cycle lasts 1.39 ms. In air at 20 °C, where sound travels at about 343 m/s, each wave is 47.6 cm (1.56 ft) long; in water it stretches to 2.06 m because sound moves about 4.3 times faster there.
Musically, 720 Hz is 47 cents below F♯5 (739.99 Hz) in standard A440 tuning. Doubling it to 1,440 Hz raises the pitch by one octave; halving it to 360 Hz lowers it by one.
Wavelength of 720 Hz in different materials
| Medium | Speed of sound | Wavelength |
|---|---|---|
| Air (20 °C) | 343 m/s | 47.6 cm |
| Fresh water | 1,481 m/s | 2.06 m |
| Seawater | 1,500 m/s | 2.08 m |
| Helium | 1,007 m/s | 1.40 m |
| Steel | 5,960 m/s | 8.28 m |
| Glass | 5,640 m/s | 7.83 m |
Harmonics and octaves
Real instruments playing 720 Hz also produce harmonics at whole-number multiples of the fundamental. Their relative strength gives each instrument its timbre.
Which animals can hear 720 Hz?
Can hear it
Humans, Dogs, Cats, Horses, Cows, Sheep, Pigs, Goats, Rabbits, Rats, Gerbils, Guinea pigs, Hedgehogs, Raccoons, Ferrets, Opossums, Chinchillas, Elephants, Bottlenose dolphins, Chickens, Canaries, Budgerigars (parakeets), Cockatiels, Owls, Bullfrogs, Tree frogs, Goldfish, Catfish, Tuna
Cannot hear it
Instruments and voices that can play 720 Hz
Frequently asked questions
What does 720 Hz sound like?
It is a clear midrange tone, close to where the human ear does most of its work for speech and melody.
Can humans hear 720 Hz?
Yes. 720 Hz is inside the typical human hearing range of 20 Hz to 20 kHz.
What musical note is 720 Hz?
720 Hz is 47 cents below F♯5, which is 739.99 Hz in standard A440 tuning.
What is the wavelength of 720 Hz?
About 47.6 cm in air at 20 °C and 2.06 m in water.
Can dogs hear 720 Hz?
Yes – dogs hear roughly 67 Hz to 45,000 Hz.