Question

define combination reactions ​

Answer 1

Answer:

When two or more reactants combine with each other to form a new product it is called as combination reaction. Combination reaction is also known as synthesis reaction. For example hydrogen gets combined with chlorine to from hydro-chloride.

Answer 2

Answer:

The objects that give out or emit light of their own are sun, electric bulb, torch, extra. The non-luminous object is one that does not produce its own light, although it can still reflect light from other sources. For example; moon, mirror, page books etc.

Complete step by step solution:

Light refers to the quantum physics particle-wave that represents an oscillating and travelling electromagnetic wave (em wave). When such a wave is detected, the energy is typically absorbed in bursts, and we call this phenomenon. The detection of a photon. It has that name because such absorption makes it seem to be a particle.

Light is just a form of energy which comes out in the packets called quanta. These packets form photons. For a luminous object to emit light, it should have the required amount of energy and when the energy light is emitted along with some other forms of energy.

Additional Information: The luminous objects are responsible for our vision, in complete darkness we cannot see or distinguish the different objects around us. Human eye perceives the light reflecting from different objects to cause the sensation of vision. In order to reflect (bounce back/ come back) from different objects, we must make the light fall on the objects. The light is generated/emitted/produced/comes from only luminous objects. Thus luminous objects are responsible for vision.

Note: 1. In order to emit light by the object it must have its own source of energy. A torch shines because of the chemical energy stored in its potteries whereas all-star shine using energy created by nuclear fusion. The sun also emits light as a result of fusion of hydrogen atoms.

2. Some examples of luminous and non-luminous objects.

Explanation:

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