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

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

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Physics
Rainbows are produced when sunlight :

Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction
None of the given statements is correct.
Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.

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