1. Where did all the antimatter go?
2. Can air make shadows?
3. How does a photon accelerate to light speed so quickly?
Answers
Answer:
1. Matter and antimatter annihilate each other on contact, and researchers believe such collisions destroyed almost all of the antimatter (and a large chunk of the matter) that initially existed in the cosmos.
2. Yes, air can indeed make shadows. A shadow occurs when an object in a light beam prevents some of the light from continuing on in the forward direction. ... Both the light and the shadow, which is just the absence of light, travel to the surface at the speed of light.
3. A photon of light does not accelerate to light speed. Rather, a photon is already traveling at light speed c when it is created. ... Like water waves, sound waves, and all other waves, light waves are already going at a certain non-zero speed the moment they are created, without needing to be accelerated.