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

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

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Physics
To resolve an object in an electron microscope,

The wavelength of the electrons must be close to the diameter of the object
The wavelength of the electrons must be greater than the diameter of the object.
Both A & B
None of these

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