Tag Archives: sound

HEARING CONTEST

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waxmothThe 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 !

frequency-hearing-range-in-man-and-some-common-animalHuman 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

SECRETS OF THE UNIVERSE

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“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.)

99% BLIND

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BLIND
If you are inhabiting the body of a human being on planet Earth,  you are 99% deaf and blind.  
However, if you are NOT inhabiting the body of a human being, you may be able to SEE!
“Consider that you can see less than 1% of the electromagnetic spectrum and hear less than 1% of the acoustic spectrum. As you read this, you are traveling at 220 km/sec across the galaxy. 90% of the cells in your body carry their own microbial DNA and are not “you.” The atoms in your body are 99.9999999999999999% empty space and none of them are the ones you were born with. Human beings have 46 chromosomes, 2 less than the common potato. …all the beautiful colors you see represent less than 1% of the electromagnetic spectrum.”
— NASA Lunar Science Institute, 2012