Physics
In the gamma decay of a nucleus

Neither the mass number nor the atomic number of the nucleus changes
The mass number of the nucleus changes whereas its atomic number does not change
Both the mass number and the atomic number of the nucleus change
The mass number of the nucleus does not change whereas its atomic number changes

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Physics
Rainbows are produced when sunlight :

None of the given statements is correct.
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
Incident on raindrops hanging in the atmosphere is dispresed after suffering reflection.

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