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Which of the following moving particles (moving with same velocity) has largest wavelength of matter waves?

1. Electron
2. α-particle
3. Proton
4. Neutron

Correct answer: Electron

Solution

The de Broglie wavelength is inversely proportional to the momentum of the particle, which depends on its mass (λ = h/p). Among the given particles, the electron has the smallest mass, resulting in the largest wavelength for the same velocity.

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