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Chapter 6: Q2DQ (page 1313)

If a proton and an electron have the same kinetic energy,which has the longer de Broglie wavelength? Explain.

Short Answer

Expert verified

Electron has longer de Broglie wavelength

Step by step solution

01

Expression for de Broglie wavelength

The de Broglie wavelength is given by

位=h2mk

Where, m is the mass of the particle and K is the kinetic energy of the particle.

02

Identification of longer de Broglie wavelength

From the above formula is it clear that the de Broglie wavelength is a function of mass.

位=h2mk

We get

位伪1m

Since the Kinetic energy is the same for both the particles, we get the wavelength is higher for the lighter particle which here is the electron

Hence Wavelength of the electron is longer.

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