I need to know why light has no mass
The first point to make is that while photons (little packets of light energy) do not have mass, they do have momentum, and a change in momentum yields a force, so in actual fact light is able to physically interact with matter.Dec 26, 2013
hittp://www.indexmundi.com/map/?v=39&r=sa&l=en
Oops:
http://www.indexmundi.com/map/?v=39&r=sa&l=en
No, that's not right! That's from another question. Here's what I meant for you:
http://www.google.com/search?sourceid=navclient&ie=UTF-8&rlz=1T4VRHB_enUS648US649&q=characteristics+of+light
Light does not have mass because it consists of particles called photons, which are massless particles. The understanding that light is composed of photons came from the wave-particle duality concept in physics.
To explain why light has no mass, we need to look at the properties of the photon. Photons are particles of light that exhibit both wave and particle-like properties. They have energy and momentum but no rest mass.
The mass of a particle is a measure of its resistance to changes in motion and determines how it interacts with other particles. Objects with mass have inertia, meaning they require a force to accelerate or change their velocity.
On the other hand, photons are described as massless particles because they do not have rest mass. Rest mass is the mass an object has when it is not moving, and it is a fundamental property of matter. Photons, being massless, do not have rest mass.
The reason why photons are massless is related to their unique nature as particles of light. Light is an electromagnetic wave, and photons are associated with the electromagnetic force. The electromagnetic force is carried by massless particles, which is why photons have no mass.
One way to prove that light has no mass is through experimentation, specifically by measuring the effects of tiny gravitational forces on light. Scientists have observed that light curves near massive objects due to gravitational lensing. This bending of light provided evidence for Einstein's theory of general relativity, which describes the gravitational interaction between mass and energy. If light had mass, its path would be affected differently, and the observed bending would not be as predicted.
In summary, light has no mass because it is composed of massless photons. Photons are carriers of the electromagnetic force and have energy and momentum but do not possess rest mass. This understanding is supported by experiments, such as gravitational lensing, which demonstrate the massless nature of light.