Physics
Man perceives sound vibrations in the frequency ranges of

20 – 20000 Hz
11 – 20 Hz
6 – 10 Hz
0 – 5 Hz

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Physics
Rainbows are produced when sunlight :

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

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