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Graphite and nuclear radiation

Subasaraswathi asked:

Is it true that graphite releases small amounts of nuclear radiation?

Relativity, Black Hole and some doubts

In the model of the big bang I would like to pose the following question. My understanding is that

1. The expansion of the universe is accelerating and

2. The radiation or shock wave to keep the analogy going is something we can measure.

My question is this. While we can rewind the clock to a single moment when the universe was infinity dense how do we know that this was a moment at all. Let me elaborate. As the universe expands could time or space time not also expand and if so than when the big bang occurred is something we cannot measure merely by rewinding the clock. If we are experiencing time at a given rate when the universe is at its current size would time not be being effected by the expansion also and if so would that mean the there was simply no start and no end to the universe? Perhaps the big bang is not as accurate as we may wish and perhaps it is our ability to comprehend that is limited. I propose there is no start or end to the universe it has always and will always be as it, and we, cannot exist without time and as such these two objects or things form a symbiotic relationship with each other. While the universe expands so does time and its effects are reduced in line with its expansion. Does this sound plausible and if not why?

Radiations sensed by eyes

Arun Asked:
“What form of radiation can your eyes detect? sir, please answer this question”
Normal Human Eyes can sense the visible spectrum only.

“The visible spectrum is the portion of the electromagnetic spectrum that is visibleto (can be detected by) the human eye. Electromagnetic radiation in this range ofwavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 390 to 750 nm.[1] In terms of frequency, this corresponds to a band in the vicinity of 400–790 THz.” ———– Wikipedia

Cosmic Rays

Do cosmic rays get reflected by a mirror?Just like the normal(visible spectrum) light, do cosmic rays and lasers get reflected by a polished surface or are they strong enough to penetrate through them? (Sangeetha Varma posted this question)

Answer: Cosmic rays are energetic charged subatomic particles, originating from outer space. They may produce secondary particles that penetrate the Earth’s atmosphere and surface. Cosmic rays were thought to be electromagnetic radiation in the past. Most primary cosmic rays entering the atmosphere from deep space are composed of subatomic particles that normally occur on Earth, such as protons, atomic nuclei, or electrons. However, a very small fraction are particles of antimatter, such as positrons or antiprotons. The precise nature of this remaining fraction is an area of active research.

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