Physics
Planets are

luminous heavenly bodies revolving around a star
non-luminous heavenly bodies
luminous heavenly bodies that twinkle
luminous heavenly bodies that do not twinkle

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

Short waves are unaffected by atmospheric disturbances.
Short waves are more energetic than long waves.
By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
Short wave broadcasts are made by nearby radio stations.

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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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