Physics
A man stands on the pan of a balance holding a fish in his right hand and bucket of water in his left hand. If he transfers the fish into the bucket, the total weight on the pan

Remains the same
First increases and then decreases
Increases
Decreases

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Physics
An electron microscope gives higher magnification than an optical microscope, because :

The velocity of electron is smaller than that of visible light
It uses more powerful lenses
The wavelength of electrons is smaller as compared to the wavelength of visible light
The electrons have more energy than the light particles

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