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Transmissivity, denoted by the symbol, is equal to zero for an opaque body.
What is the body that cannot be seen?
An opaque body is one that does not transmit any of the radiation that is directed toward it, although some of the energy may be reflected…. A body is said to be transparent if it allows all of the radiation that strikes it to pass through it.
Which of these statements is correct regarding an opaque body?
Explanation: The total amount of absorptivity and reflectivity that an opaque body has is equal to one.
What exactly does “opaque body Mcq” mean?
The term “opaque body” refers to any body in which the atoms are packed so densely together that light cannot travel through them. whereas a black body’s opacity determines whether or not light is able to travel through it depending on whether or not it is transparent.
What will the coefficient of transmission be for something that is completely opaque?
Since we already know that an opaque material does not let any light at all pass through it, we may deduce that the amount of light transmitted (Et) by an opaque body is equal to zero. This indicates that the transmission coefficient for an opaque body is always equal to zero, regardless of the energy of the incident wave.
ABSORPTIVITY||REFLECTIVITY||TRANSMISSIVITY||BLACK BODY|| WHITE BODY || GREY BODY|| OPAQUE BODY||
29 questions found in related categories
What is the refractive index of a body that doesn’t let light through?
Hello Vrushab, The ratio of the speed of light in a vacuum to the speed of light in the medium is known as the medium’s refractive index. The formula for calculating the index of refraction of an opaque medium is as follows: Hence, the index of refraction of an opaque medium is equal to INFINITY.
What is the formula for calculating the coefficient of transmission?
The standard abbreviation TC. Note 1: The transmission coefficient can be calculated using the formula T e = (2m 2 cos A)/(m 2 cos A + m 1 cos B) in the case of oblique incidence and when the electric field component of an incoming plane-polarized electromagnetic wave is parallel to the interface surface.
Where does the GREY body come from?
A gray body is a type of imperfect black body, which refers to a material item that only partially absorbs electromagnetic radiation that is directed at it. The emissivity of a gray body is defined as the ratio of the thermal radiation emitted by a gray body at the same temperature to the thermal radiation emitted by a black body at the same temperature.
What are some examples of things that are opaque?
Wood, stone, metals, concrete, and other similar materials are typical examples of things that have an opaque appearance. Both of these materials let light travel through them without obstruction… There is scarcely any reflection or scattering of the light. Because they do not reflect light, transparent things give the impression of having no color.
In the context of heat transfer, what exactly is a black body?
The concept of a black body refers to an imaginary object that is capable of entirely absorbing all wavelengths of heat radiation that are directed toward it. These types of bodies do not reflect light and, as a result, look black if their temperatures are low enough that they are not capable of producing their own light. When heated to a certain degree, any and all black bodies will emit thermal radiation.
In terms of absorptivity, what does the gray body present?
At a given temperature, the absorptivity of a grey body is defined as the ratio of the amount of energy absorbed by the body to the amount of energy absorbed by a black body. It is important to keep in mind that the definition of the absorptivity is comparable to the definition of the emissivity.
What reflectivity means?
: the reflective quality or power of a surface or material … undertaking “reflectivity studies” to determine whether or whether the glittering effect created by Saudi sand when viewed via goggles causes pilots to become disoriented and cause their helicopters to crash into the ground. –
Are there no differences between emissivity and absorptivity?
The emissivity of any physical item is also a function of the wavelength of the incident light. It is important to keep in mind that the absorptivity and the emissivity are perfectly balanced with one another when an item is in thermal equilibrium with its surroundings (stationary state circumstances, at the same temperature, and no net heat transfer).
What is GREY body and black body?
A gray body is a body whose absorptivity of surface does not vary with fluctuation in temperature and the wavelength of incident radiation, in contrast to a black body, which is an entity that absorbs all of the radiant energy that reaches its surface from all directions.
Is Black an opaque?
An opaque item is not transparent (in which case it permits all light to pass through) nor translucent (in which case it permits some light to pass through)…. Because an opaque substance does not allow any light to pass through it, the light that does pass through it is either reflected, scattered, or absorbed. Mirrors and carbon black both have an opaque quality.
What does not lack transparency?
adjective. not transparent or translucent; not allowing light to pass through; not being able to be seen through by light
What are three examples of anything that is opaque?
A substance that does not let any light pass through it is known as an opaque object. Concrete, wood, and metal are all examples of materials that have an opaque appearance. Some substances can be opaque to light while being transparent to other forms of electromagnetic radiation.
Can you give me ten examples of things that are opaque?
Illustration board, cemented walls and roofs, cardboard pieces, books, wood, metal, aluminum, and certain types of plastic are all examples of opaque materials. The following materials are considered to have a trace amount of transparency: butter paper, ground glass, thin sheets of plastic, thin sheets of paper, etc.
What are three examples of anything that is transparent?
Glass, water, and air are all good examples of things that are transparent. Translucent substances are referred to as translucent, and examples of such substances are frosted glass and wax paper. Translucent substances also allow some light to flow through them.
What exactly is an example of a black body?
A hollow that contains a hole is an excellent illustration of a black body. There is no light that is reflected back from the cavity when light is incident upon it; rather, light enters the cavity through the hole when light is incident upon it.
How do GREY bodies emit heat onto their surroundings?
It is important to keep in mind that grey bodies are capable of absorbing some radiation while simultaneously reflecting some of the radiation that is emitted from their surfaces back into space. Please refer to the image that is provided. Irradiation, or G, is the total amount of radiation that comes into contact with a surface in a certain amount of time and area. It is represented in the graphic above by the letter G.
In the field of remote sensing, what exactly is a GREY body?
The “Grey body emissivity” approach is used to retrieve temperature and emissivity from remotely sensed photographs…. The model that was created as a result is referred to as “grey body emissivity,” and it has the potential to be utilized in order to determine the emissivity of soils and other natural materials.
What exactly is the unit that the transmission coefficient is measured in?
The range of the transmission coefficient, also known as the factor, is from 0 to 1, and it is defined as the ratio of the sound power that is transmitted, Wt, to the sound power that is incident, Wi.
How do you determine the reflective intensity of an object?
The intensity reflection coefficient for any boundary between two mediums is given by the equation a=(Z2Z1)2(Z1+Z2)2. This equation is written as a = (Z 2 Z 1) 2 (Z 1 + Z 2) 2, and the acoustic impedance of muscle is given in Table 1.