Physics
A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum:

Just before it touches the ground
When it is just on the half-way
Just after it is dropped
When it touches the ground

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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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