Physics
Intensity of any wave is proportional to which of the following?

Square of amplitude
Amplitude
Square root of amplitude
Cube of amplitude

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Physics
To resolve an object in an electron microscope,

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

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

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

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