Question

Which of the following is not a luminous object
(A). Sun
(B). Moon
(C). Bulb
(D). Candle

Answer 1

Hint: Before attempting this question one should have prior knowledge about the concept of luminous and non-luminous objects which explains about the ability of a body to generate light of its own or not, use this information to approach towards the solution.

 Complete step-by-step solution -
Before answering this question let’s discuss about what are luminous and non-luminous objects
So the object or body which has the ability to generate the light of its own is called a luminous object whereas the object which doesn’t have the ability to generate light of its own is called a non-luminous object.
Now let’s talk about the objects mentioned in the above question
We know that the sun is the source of light which emits light of its own and also provides light to the objects and planets such as earth and the planets in the solar system. Since sun has the ability to emit light of its own therefore it is a luminous object
Moon is a planet which glow with the help of the light of sun after reflecting so we can say that since moon can’t emit light of its own it is a non-luminous object
Bulb emits light by heating tungsten wire present in it when electric current passes through it since tungsten wire is the part of bulb and bulb emits light of its own therefore it is a luminous object.
Candle is also a luminous object since it emits light by the burning of the tread on it.
Since there is only object among all the option which do not emit light of its own is moon
Hence option B is the correct option.

Note: In the above question we used a term “light” which can be explained as an electromagnetic radiation which have some wavelength there are so many types of light sun as gamma rays, X-rays, radio waves, etc. but not all light are not visible for human eyes light X-rays, microwaves, etc. a photon is a basic unit of light.