Speed of Sound

The rate of a sound wave, the speed of sound is calculated at 343 meters per second (1,125 feet per second.

2,438 Questions
Science
Speed of Sound

Why is vacuum a good insulator?

A vacuum is a good insulator because it prevents the transfer of heat by eliminating the medium (matter).
A perfect vacuum is the absence of matter. Heat is transferred by conduction, convection and radiation. Radiation is the only form of heat transfer that does not need a medium. Furthermore, radiation is generally the least efficient method of heat transfer.

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Science
Speed of Sound

Does air pressure affect the speed of sound?

The speed of sound in air is independent of pressure.
The speed of soundis a function of temperature.

Humidity has a small effect on the speed of sound.

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Physics
Speed of Sound

Does sound travel faster or slower in water than it does in air?

Short and simple:

Sound is a compression (or pressure) wave.

There are two things that affect the speed of sound, the density of a material and its compressibility. Specifically, the speed of sound is proportional to the square root of the ratio.

v=sqrt(B/rho)

v=speed of sound.

B= bulk modulus. (There are different names for this material property such as coefficient of stiffness).

rho= mass density.

A greater density of a material tends to slow the velocity of sound but a greater stiffness tends to increase the velocity of sound.

The bulk modulus of water is 15,000 times greater than air while the density of water is not even one thousand times greater.

Bulk modulus wins out and the velocity of sound in water is more than four times the velocity in air.

This relationship causes the speed of sound to be greater in most materials, but there are exceptions.

More Details:

The reader should be warned that there is much more to sound in materials than one see in the simple compression waves of air. Further, materials like steel come in various compositions and the micro structure depends on the processes that make it, so there is no such thing as a single number fore the speed of sound in steel.

Here are a few typical numbers for bulk modulus (stiffness) and density.

Air(adiabatic)

B= 1.42×10^5 Pa rho= 1.22 kg/m^3

Water

B=2.2×10^9 Pa rho= 1,000 kg/m^3

Steel

B= 160 x10^9 Pa rho=7,860 kg/m^3

v_air = 340 m/s.

v_water = 1482 m/s

v_steel= 4500 m/s

Caveat: As stated above, these numbers should be taken as approximate since various complications such as temperature and composition have not been explained.

239240241
Physics
Speed of Sound
Air Guns and Air Rifles

How fast do you have to be moving to break the sound barrier?

Mach 1 is the speed at which you break the sound barrier. The speed of sound, or Mach 1, at sea level and under "standard condition" is:

  • 1,116.4 ft/s
  • 340.3 m/s
  • 761.2 mph
  • 1,225.1 km/h
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Airplanes and Aircraft
Technology
Speed of Sound

Who died trying to break the sound barrier?

Geoffrey de Havilland, Jr has died from trying and some others.

187188189
Physics
Airplanes and Aircraft
Speed of Sound

Does the Blackbird SR-71travel faster than the speed of sound?

Yes, the Blackbird SR-71 travels at mach 3, which is 3 times the speed of sound.

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Acronyms & Abbreviations
Definitions
Spanish to English
Speed of Sound

What does sonar mean?

Sound navigation and ranging.
Sonar stands for SOund NAvigation and Ranging.

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Speed of Sound

How fast is mach 2 in mph?

1522.4141 mph

717273
Physics
Speed of Sound
Waves Vibrations and Oscillations

Why won't sound travel in a vacuum?

Any sound waves use a medium to travel along (on Earth the medium is Air, Water or any Solid.

A Vacuum, like Space, does not contain any particles; therefore sound waves have no medium through which to travel and thus Sound will NOT Travel (or be heard).

More information

Sound or Sound Waves, are mechanical energy, and require a mechanical medium to propagate (or travel). That means that the medium must behave or respond in some mechanical way to conduct sound. Air or any liquid or solid will respond mechanically to the compression and refraction of a Sound Wave.

In a vacuum, there is no Mechanical Medium and so Nothing to be compressed, so no sound will travel.
Because sound, unlike light, needs a medium, usually air. In a vacuum, there is no air.
Sounds cannot trasvel in a vacuum because they have no medium in which they can travel through.
Sound travel through matter, trough the interaction of the electrical force between particles.

Vacuum is per definition empty of matter, so there is nothing for a sound wave to propagate trough.
Sound relies on the movement of atoms to propagate.
Sound is simply the vibration of atoms in the air but a vacuum contains no atoms so there are no atoms to vibrate and sound cannot travel.

737475
Physics
Thunderstorms and Lightning
Speed of Sound

Supersonic jets can travel faster than the speed of sound this is called Mach 1?

Close! Actually, Mach-1 is the speed of sound. anything above Mach-1 (Mach-(1-5)) is supersonic, all the way up to Mach-5, at which point an object is called "Hypersonic". Sometimes speeds above Mach-10 are referred to as "High-Hypersonic". So, a jet moving at Mach-1 wouldn't actually be traveling FASTER than sound, it would be traveling AS FAST as sound.

103104105
Physics
Speed of Sound

What speed breaks the sound barrier?

762 mph at sea level breaks the sound barrier

484950
Astronomy
Planetary Science
The Moon
Speed of Sound

How long would it take to circle the earth At the speed of sound?

At or very near the surface it would take almost 34 hours.

555657
Science
Physics
Speed of Sound

Why is a large range of speeds of sounds given for wood and glass?

i have cum

012
History, Politics & Society
Speed of Sound
History of Aviation

How fast did chuck yeager go to break the sound barrier?

660 mph

535455
Speed of Sound
Electromagnetic Radiation
Waves Vibrations and Oscillations
Sound Waves

What is the difference between heat waves and sound waves?

Heat waves are a form of electromagnetic radiation. Therefore, they are transverse waves (oscillate perpendicularly to the direction of propagation) and need no medium to travel through. Sound waves, on the other hand, are mechanical waves, meaning they need a medium to travel through. If that medium is a liquid or a gas, sound waves oscillate longitudinally (in the direction they're traveling). If that medium is a solid, they oscillate both longitudinally and transversely.

757677
Dodge Ram
Physics
Speed of Sound

What could a rotation sound that increases with speed coming from behind the dash of A '96 dodge ram 1500 be?

It could be a failing speed odmeter cable. remomove the cable from the transmission and see if the noise stops.

737475
Speed of Sound
Air Guns and Air Rifles

How many fps does a pellet have to shoot to break the sound barrier?

It must travel over 1126 FPS to break the sound barrier. several air rifles are capable of this speed.

636465
Physics
Speed of Sound

Does the speed of sound in air depend on temperature?

The speed of sound changes with temperature.

676869
Lexus LS
Speed of Sound

How do I increase the sound of my blinker at my 1999 Lexus LS 400?

If you are asking for the location of the Turn Signal Flasher Relay, it is located in Junction Block 1A (under dash on drivers side). Block 1B has the fuses, Block 1A the relays. The flasher is the small relay at the end opposite the group of four (4) relays.

666768
Physics
Electromagnetic Radiation
Speed of Sound
Waves Vibrations and Oscillations

Velocity of ultrasonic wave using acoustic grating?

The ultrasonic waves generated with the help of a quartz crystal inside the liquid in a container sets up standing wave pattern consisting of nodes and anti-nodes. The nodes are transparent and anti-nodes are opaque to the incident light. In effect the nodes and anti-nodes are acts like grating(a setup of large number of slits of equal distance) similar to that of rulings in diffraction grating. It is called as acoustic grating or aqua grating. Hence, by using the condition for diffraction, we can find the wavelength of ultrasound and thereby the velocity of sound in the liquid medium.

252627
Physics
Science Experiments
Speed of Sound

How does temperature affect the speed of sound through air?

The way in which the speed of sound through air is affected by temperature is demonstrated by the formula: v= (331.5 + 0.606 x T) m/sec, where T = temperature.

In general sound travels faster through warm air than through cold.

636465
Energy
Speed of Sound

The speed of an object traveling below the speed of sound is called?

subsonic

636465
Speed of Sound

Does sound travel faster and clearer on land or water?

On water because on land there are trees and other plants and buildings to block the sound but on water there are no buildings trees and plants on the surface! Hope this helped :)

That does not have much to do with it. sound travels through denser gas or liquid faster. "In common everyday speech, speed of sound refers to the speed of sound waves in air. However, the speed of sound varies from substance to substance. Sound travels faster in liquids and non-porous solids than it does in air. It travels about 4.3 times faster in water (1,484 m/s), and nearly 15 times as fast in iron (5,120 m/s), than in air at 20 degrees Celsius".

Air at sea level is about 800 times less dense than saltwater. additionally sound waves that travel through the air and waves that travel through dense liquids and solids are different

616263
Energy
Speed of Sound

What is the speed of sound in air at 42.0 ºC?

Speed of sound in air is c ≈ 331 + 0.6 × T.

T = Temperature in °C.

Speed of sound in air at 42°C is c ≈ 331 + 0.6 × 42 = 356.2 m/s.

616263
Chevy Silverado
Subaru Legacy
Physics
Speed of Sound

Why does 1990 Subaru legacy stall at speed and backfire through the air intake?

I'd check the timing and the distributor cap. 1990 Legacy has no distributor, but twin-coil ignition, fired 2 cylinders at a time. When one cylinder is on Power stroke, the other one on that same coil is between the Exhaust and Intake strokes, so the spark is wasted and does no harm. A stall at speed, possible accompany by backfire through the intake, is usually ignition trouble, often defective cam and/or crank sensors. Presuming your engine will restart and run OK once it cools down, this means the engine itself is OK (you have not jumped a timing belt, for example). When cold engine, if you have good power, this means the fuel system is OK, and it is ignition. Coils are firing at the wrong time, so backfires. Hope you are using the correct resistor-type spark plugs for your engine, or you will get influx-firing. my car has the same problem a 93 Legacy i have a faulty fule pressure sensor which is a defect in alot of Subarus i havent had it fixed yet because i lost the part number and am online not trying to find it. What happens is the car thinks there is no gas and it stalls when Accelerating i find it happens much more often when the tank is low on gas like a quarter and under. i took me 4 years an alot on money to find the problem good luck

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