Physics
The ordinary and maximum tolerance limit of sound by human being is

60 db to 80 db (decibel)
50 db to 70 db (decibel)
65 db to 75 db (decibel)
70 db to 85 db (decibel)

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Physics
It is dangerous to observe Solar eclipse with naked eyes because

Cosmic rays reach eyes more during the eclipse
All radiations from sun initiate chemical reactions in eyes
Infrared radiations from sun burn our retina
Ultraviolet radiations from Sun burn our retina

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