de Broglie Wavelength

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1.
An electron is accelerated through 100 V. Its de Broglie wavelength is:
2.
An electron and a proton have the same kinetic energy. The ratio of their de Broglie wavelengths is approximately:
3.
If the kinetic energy of a particle is quadrupled, its de Broglie wavelength:
4.
An electron and a proton have the same speed v. The ratio λ_e/λ_p is:
5.
The de Broglie wavelength of a particle of mass m moving with velocity v is:

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