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The de Broglie wavelength of a photon

Question:

The de Broglie wavelength of a photon is twice the de Broglie wavelength of an electron. The speed of the electron is ve = c/100. Then

(a) Ee/Ep = 10-4

(b) Ee/Ep = 10-2

(c) Pe/mec = 10-2

(d) Pe/mec = 10-4

Solution:

The correct answers are

(b) Ee/Ep = 10-2

(c) Pe/mec = 10-2

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