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

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

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Physics
Which one of the following is not a property of electromagnetic waves?

Electromagnetic waves do not show interference and diffraction.
Electromagnetic waves do not require a medium to propagate.
Electromagnetic waves are transverse waves
Oscillating electric field and magnetic field are perpendicular to each other.

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