Question

State whether the given statement is true or false.
Sun is a non-luminous object.
A. True.
B. False.

Answer 1

Hint: Luminous objects are objects that give off light, like the sun, a light bulb filament when electrified, and glow bugs. Non-luminous objects are objects that don’t give off light.If we want to get technical, many objects are semi-luminous. They re-radiate light in the form of heat (infrared).

Complete answer:
We know that the objects that can emit light energy by themselves are known as luminous objects. These objects can cause the sensation of light. The luminous objects are visible because they emit their own light.
Therefore the sun is a luminous object.
Hence the above given statement that the sun is a non-luminous object is false.

So, the correct answer is “Option B”.

Additional Information:
Objects that cannot emit light energy or do not have their own light energy are known as non-luminous objects. This is because objects do not cause the sensation of light. The non-luminous objects can be visible with the help of luminous objects. The two examples are the moon and plants.

It is a luminous or a radiating object, because anything that has a temperature above absolute zero will emit E.M radiation.

Earth doesn’t glow visibly because the spectrum of thermal EM radiation emitted by an object depends on its temperature. This dependence is because of Planck’s law for Blackbody radiation. When the object is hotter its wavelength is shorter due to which its thermal emission spectrum peaks. Earth is not hot enough to glow at visible wavelengths; its spectrum peaks at wavelengths lie in the infrared region.

Note:
We know that the light is a combination of electrical and magnetic energy which can also pass through transparent and translucent objects. The objects which do not emit their own light are known as non-luminous objects.
Another interesting fact which we should know is that a mirror is also an example of a non-luminous object.