KVPY SX SB Exam 2016 Question Paper

Question : 35 of 120

Marks: +1, -0

An electron and a photon have same wavelength of

10^{–9}

m. If E is the energy of the photon and p is the momentum of the electron, the magnitude of E/p in SI units is

Solution:

Energy of photon

=E={hc}/λ

Momentum of photon

=P=h/λ

E = PC

∴E/P=C=3×10^8\m\/s

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