Question:medium
What wavelength must electromagnetic radiation have if a photon in the beam has the same momentum as an electron moving with a speed $1.1 \times 10^5$ m/s (Planck’s constant $= 6.6 \times 10^{-34}$ Js, rest mass of electron $= 9 \times 10^{-31}$ kg)?
What wavelength must electromagnetic radiation have if a photon in the beam has the same momentum as an electron moving with a speed $1.1 \times 10^5$ m/s (Planck’s constant $= 6.6 \times 10^{-34}$ Js, rest mass of electron $= 9 \times 10^{-31}$ kg)?
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Photon momentum depends only on wavelength: $p = h/\lambda$.
Updated On: May 1, 2026
- $2/3$ nm
- $20/3$ nm
- $4/3$ nm
- $40/3$ nm
- $3/20$ nm
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The Correct Option is C
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