why is it the colder the temperature, the faster the ultrasonic wave?
456301
Air is more dense when cold.
504847
It gets colder. So clearly not isothermal (which means it stays the same temperature). It's adiabatic because no energy is released or absorbed.
166184
The frequency can be converted to energy, which has an equivalent temperature. Your question is rife with confusion. I attached a reference about the Big Bang that might clear some of it up.\n\nHere is the way to get the temperature of a wave of frequency f:\n\nE=hf\n\nwhere E is energy and h is Planck's constant. Also, for each degree of freedom, \n\nE=kT/2\n\nso for the photon with 2 degrees of freedom (2 spins), \n\nE=kT\n\nwhere k is Boltzmann's constant (the universal gas constant divided by Avogadro's number), and T is temperature.\n\nso T=E/k=hf/k \n\n(see references)
1187086
Higher temp = faster diffusion. Higher temps give the atoms more heat, which is basically a faster rate of the atoms vibrating. If they move around faster, they'll obviously diffuse farther in the same amount of time. Next time, do your own homework
114884
Hot water does not freeze faster than cold, all conditions being the same, such as altitude, air pressure, and amount of cold applied to the water to make the water freeze.
1182013
Air molecules are spread apart when its hot, and closer together when cold, which reflects on how sound is traveled
71035
Not 100% sure. But I think its because the air inside isn't moving. The air inside is stationary, while it is continuously circulating outside, which causes changes in the temperature. IMHO
587432
Colder air is "thicker," moves much more slowly than does hot air, and is heavier than warmer air...Air will set up a gradient from the coldest at the bottom to the hottest at the top in a container...
732805
Increasing the temperature (adding energy) increases the molecular vibration.
60412
cold and gettin' colder. in the last 15 min. the temp went from 30 to 32 degrees. out here we call that a heat wave.
922727
The reason is that heat causes molecules to move faster - the cold slows them down. Think of it like molasses when it is cold it is really thick and flows slowly - but if you heat it up it thins out and would flow more easily. When molecules are heated they are easier to manipulate. I hope this helped.
656503
It doesn't.  Ice melts more slowly on a colder surface because when ice melts it must draw heat from the surrounding environment, and when there is less heat available it takes longer.\n\n____________\nEdit: as a college science major, I can tell you it simply doesn't work that way.  However, there are a number of factors besides temperature that effect ice melting.  For example, if the piece of ice on the colder block was considerably thinner than the ice on the warmer block the one on the colder block might still melt faster.  In biology, we sometimes melt small amounts of liquid on ice because bad things happen if they get too warm, and two microliters of frozen liquid on ice generally melts faster than ten mililiters in warm (about 98˚F) water.\n\nAnother factor that effects melting point is solutes dissolved in the water before it was frozen.  Salt water freezes at a lower temperature, and consequently melts at a lower temperature, than pure water (that's why the salt the roads in the winter).  If there were a lot of salt dissolved in the piece of ice on the cold block, then depending on the temperatures of the two blocks, the one on the cold block might melt faster.\n\nIt's also possible that one or both pieces of ice weren't water at all.  There are plenty of clear liquids out there that melt at various temperatures.  A compound with a lower freezing point will tend to melt faster, possibly even at a lower temperature.\n\nAnother factor is the starting temperature of the ice.  In one of the biology labs at my school we have a freezer that's at -80˚C, and the normal ones at 4˚C.  If you take a piece of ice out of the -80˚C freezer and one out of the 4˚C freezer, they're both frozen, so they're both ice, but the one at -80 is a lot colder, and is going to take a lot longer to melt, even at a warmer temperature, because it has to warm back up to 0˚C before it can even start to melt.\n\nBut, of course, the obvious explanation is that either your teacher lied to you, or you lost track of which block was which at some point in the demo.
700465
its the same concept when comparing a cup of 100 degree coffee to a hot tub filled with 100 degree water.  the hot tub is hotter because even though the temperature is the same the total heat and energy in the hot tub is greater.  remember that heat measures the total energy of the substance and temperature is just the average kinetic energy.  since there is more substance in then hot tub there will be more heat.
629453
warm water dissolves ice faster than warm air because it can transfer and absorb heat faster than warm air of the same temperature
550989
Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. In fact, sound waves travel over 17 times faster through steel than through air. The exact speed of sound in steel is 5,960 meters per second (13,332 mph)! But, this is only for the majority of solids. The speed of sound in all solids are not faster than in all liquids.
214499
It all has to do with altitude. The higher you are from the earth, the colder it gets. Air is also thinner.
989577
There isn't enough energy at near kelvin temperatures for molecules to do all their normal movements and fluctuations.  \n\nThe contrast to this state occurs at any temperature above 'near absolute zero', take for example the nominal temperatures we are comfortable with.  At this temperature there is more than enough energy available for a molecule to bend and vibrate in literally millions of ways....these vibrations occur on the picosecond timescale and for the most part, all accessible ways to vibrate and bend.\n  As the temperature is reduced there are less vibrational modes available and the more high energy ways to vibrate (generally those involving less favourable configurations) start to not occur.  \n\nThe vibrational efficiency and capability of a molecule thus decreases to the point of a few possible vibrational modes as absolute zero is approached.