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What is more dense a cold object or a hot object?
A cold object is more dense.
An hot object emits less radiation than a cool object emits?
Generally, yes. For example, a hot coil may emit infrared or even red light, and hot iron glows. When cool, however, they do not emit light. The reason is that electrons are given more energy from the heat, so they raise in their location from the atom, and when they return to a stable location they give off light.
Why does a large object absorb and emit radiation faster than a small object?
Because of the large object has more surface area.
Do hot objects absorb infrared radiation?
All objects emit (give out) and absorb (take in) thermal radiation, which is also called infrared radiation. The hotter an object is, the more infrared radiation it emits. However; the hotter an object, the faster it will emit infrared radiation. Even though hotter objects can absorb infrared radiation, they will continue to emit infrared radiation much faster than they absorb it from any colder objects / sources around them, until an equilibrium is achieved with the objects surroundings i.e. it is always an antagonistic relationship with the objects surroundings and the surroundings with the object.
When does an object have more thermal energy when it is hot or cold?
Hot.
What is more dense a cold object or a hot object?
A cold object is more dense.
An hot object emits less radiation than a cool object emits?
Generally, yes. For example, a hot coil may emit infrared or even red light, and hot iron glows. When cool, however, they do not emit light. The reason is that electrons are given more energy from the heat, so they raise in their location from the atom, and when they return to a stable location they give off light.
Does thermal energy only move between warm objects?
Thermal energy will pass from any object to any colder object. They don't need to be "warm." However, thermal radiation is proportional to the fourth power of the temperature, so that means that a hotter object will emit MUCH more thermal radiation than a cold object.
What are the factors that increase the rate at which an object emits thermal radiation?
The hotter the object the more it radiates. The blacker the surface the more it radiates. The surrounds only affect the total loss of heat from the object, not the actual rate the object emits thermal radiation. From my imperfect memory I seem to recall that the rate an object looses heat by radiation to its environment is proportional to the forth power of the difference in temperature between the object and the environment.
Why does a large object absorb and emit radiation faster than a small object?
Because of the large object has more surface area.
Does a cold object still have heat?
Yes, it still has some amount of internal energy or "heat". Even considering the coldest objects in the universe, it is still impossible for an object to have no heat, and this theoretical state is known as absolute zero.
Do hot objects absorb infrared radiation?
All objects emit (give out) and absorb (take in) thermal radiation, which is also called infrared radiation. The hotter an object is, the more infrared radiation it emits. However; the hotter an object, the faster it will emit infrared radiation. Even though hotter objects can absorb infrared radiation, they will continue to emit infrared radiation much faster than they absorb it from any colder objects / sources around them, until an equilibrium is achieved with the objects surroundings i.e. it is always an antagonistic relationship with the objects surroundings and the surroundings with the object.
When does an object have more thermal energy when it is hot or cold?
Hot.
What happens to an unstable nuclei?
They give out radiation to become more stable.
Which object emits the most radiation of these 4. Water dirt fir or ice?
It isn't clear what sort of radiation you are talking about. If you mean infrared radiation, if the temperature is the same, darker objects do tend to emit more radiation.
What is the relationship between wavelengths and temperature?
There is a relationship between the temperature of an object and the wavelength at which the object produces the most light. When an object is hot, it emits more light at short wavelengths while an object emits more light at long wavelengths when it is cold. The amount of radiation emitted by an object at each wavelength depends on its temperature.
Method of heat transfer?
Convection: when two material touch, Conduction: in a fluid (this involves a bulk flow rate of the fluid and the calculations are usually ignored in basic high school physics), and Radiation: in jaja.
