Many lung cancer patients have no cough at all. However, a cough may, at times, be a sign of lung cancer. Lung cancers may irritate the lungs or windpipe, stimulating a cough. Whether a cough is dry or produces mucus is not related to whether a lung cancer is present.
A laser emits photons. Photons (from Greek ÏÏÏ, meaning light), in many atomic models in physics, are particles which transmit light. In other words, light is carried over space by photons. Photon is an elementary particle that is its own antiparticle. In quantum mechanics each photon has a characteristic quantum of energy. Photons have a rest mass of 0 (zero). However, Einstein's theory of relativity says that they do have a certain amount of momentum.
To put it simply photons are the fundamental particle of light. They have a unique property in that they are both a particle and a wave. This is what allows photons unique properties like refraction and diffusion.o put it simply photons are the fundamental particle of light. They have a unique property in that they are both a particle and a wave. This is what allows photons unique properties like refraction and diffusion.