Physics
A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments

Depends on the total mass of all the fragments
Is infinity
Depends on the speeds of various fragments
Is zero

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Physics
The blue colour of sky is due to

Reflection of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere
Refraction of sunlight
Scattering of longer wavelengths of sunlight in the atmosphere

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