Republished by Blog Post Promoter
Ahhhhh….. The sound of flowing water is so soothing. I’m going to take a nap. Enjoy your day, my friends.
Tag Archives: sound
8 HOURS OF BABBLING BROOK SOUNDS
Republished by Blog Post Promoter
Aahhhhh……. Relax, rest, release…..
HEARING CONTEST
Republished by Blog Post Promoter
The bat is the king of extreme hearing in the mammalian world. It uses echolocation, emitting ultrasonic sounds and measuring the length of time before the sounds echo back, in order to locate prey. But it turns out there’s an animal that uses an even more extreme variety of sounds.
Ultrasound simply refers to a sound that is outside a human’s sonic range–which isn’t that hard, really, as humans have modest auditory abilities. Researchers discovered that the greater wax moth (Galleria mellonella), a dull-colored, generally boring and common moth, has the most extreme hearing sense of any known animal. It’s capable of hearing sounds frequencies of up to 300,000 Hz !
Human ear frequencies ranging between 20 Hz (lowest pich) and 20,000 Hz (highest pitch). Below 20 Hz (infrasounds), some species as the mole or the elephant are still hearing (they can for instance hear some vibrations from earthquakes). Similarly, lot of mammalian species can hear over 20,000 Hz (ultrasounds). Thus, cats and dogs hear up to 40,000 Hz, and dolphins or bats hear up to 160,000 Hz. The video below demonstrates the human spectrum of hearing.
Here is a comparative chart of hearing for various animals. Porpoises and whales and bats have the most sensitive hearing among mammals.
| Species | Approximate Range (Hz) |
| human | 64-23,000 |
| dog | 67-45,000 |
| cat | 45-64,000 |
| cow | 23-35,000 |
| horse | 55-33,500 |
| sheep | 100-30,000 |
| rabbit | 360-42,000 |
| rat | 200-76,000 |
| mouse | 1,000-91,000 |
| gerbil | 100-60,000 |
| guinea pig | 54-50,000 |
| hedgehog | 250-45,000 |
| raccoon | 100-40,000 |
| ferret | 16-44,000 |
| opossum | 500-64,000 |
| chinchilla | 90-22,800 |
| bat | 2,000-110,000 |
| beluga whale | 1,000-123,000 |
| elephant | 16-12,000 |
| porpoise | 75-150,000 |
| goldfish | 20-3,000 |
| catfish | 50-4,000 |
| tuna | 50-1,100 |
| bullfrog | 100-3,000 |
| tree frog | 50-4,000 |
| canary | 250-8,000 |
| parakeet | 200-8,500 |
| cockatiel | 250-8,000 |
| owl | 200-12,000 |
| chicken | 125-2,000 |
CRICKET CHOIR
Republished by Blog Post Promoter
If you do not already appreciate the marvel of biological engineering found in life forms on Earth, and the inherent “harmony” of the physical universe, this sound recording may give you an new perspective.
Crickets have a short life span compared to humans. A composer by the name of Jim Wilson recorded the sound of crickets and then slowed down the recording to the relative equivalent of the human lifespan. The crickets sound like they are singing the most beautiful chorus of a human voice choir, in perfect harmony. Though you may think it is human voices, everything you hear in this recording is in-fact crickets themselves!
This recording contains two tracks played at the same time: The first is the natural sound of crickets played at regular speed while the second is the slowed down version of crickets’ voices.
SECRETS OF THE UNIVERSE
Republished by Blog Post Promoter
“IF YOU WANT TO FIND THE SECRETS OF THE UNIVERSE, THINK IN TERMS OF ENERGY, FREQUENCY AND VIBRATION.” — Nikola Tesla
The full experiment:
WIKIPEDIA DEFINITION OF TERMINOLOGY:
The hertz is named after the German physicist Heinrich Hertz (1857–1894), who made important scientific contributions to the study of electromagnetism. The name was established by the International Electrotechnical Commission (IEC) in 1930.[6] It was adopted by the General Conference on Weights and Measures (CGPM) (Conférence générale des poids et mesures) in 1960, replacing the previous name for the unit, cycles per second (cps), along with its related multiples, primarily kilocycles per second (kc/s) and megacycles per second (Mc/s), and occasionally kilomegacycles per second (kMc/s). The term cycles per second was largely replaced by hertz by the 1970s.
Applications
Sine wave with varying frequency.
Details of a heartbeat as an example of a non-sinusoidal periodic phenomenon that can be described in terms of hertz. Two complete cycles are illustrated.
Vibration
Sound is a traveling longitudinal wave which is an oscillation of pressure. Humans perceive frequency of sound waves as pitch. Each musical note corresponds to a particular frequency which can be measured in hertz. An infant’s ear is able to perceive frequencies ranging from 20 Hz to 20,000 Hz; the average adult human can hear sounds between 20 Hz and 16,000 Hz.[7] The range of ultrasound, high-intensity infrasound and other physical vibrations such as molecular vibrations extends into the megahertz range and well beyond.
Electromagnetic radiation
Electromagnetic radiation is often described by its frequency—the number of oscillations of the perpendicular electric and magnetic fields per second—expressed in hertz.
Radio frequency radiation is usually measured in kilohertz (kHz), megahertz (MHz), or gigahertz (GHz). Light is electromagnetic radiation that is even higher in frequency, and has frequencies in the range of tens (infrared) to thousands (ultraviolet) of terahertz. Electromagnetic radiation with frequencies in the low terahertz range, (intermediate between those of the highest normally usable radio frequencies and long-wave infrared light), is often called terahertz radiation. Even higher frequencies exist, such as that of gamma rays, which can be measured in exahertz. (For historical reasons, the frequencies of light and higher frequency electromagnetic radiation are more commonly specified in terms of their wavelengths or photon energies: for a more detailed treatment of this and the above frequency ranges, see electromagnetic spectrum.)