Physics
The Laser is a beam of radiations which are

Non-coherent and monochromatic
Coherent and monochromatic
Non-coherent and non-monochromatic
Coherent and non-monochromatic

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Presence of gravity outside but not inside the spacecraft
Fact that spacecraft in the orbit has no energy
Absence of gravity outside
Acceleration in the orbit which is equal to the acceleration due to gravity outside

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