Physics
The device used for measuring the wavelength of X-rays is

G.M. Counter
Mass Spectrometer
Bragg Spectrometer
Cyclotron

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

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

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