356381
What percentage increase in wavelength leads to \({75 \%}\) loss of photon energy in a photon-electron collision?
1 \({200 \%}\)
2 \({100 \%}\)
3 \({67.7 \%}\)
4 \({300 \%}\)
Explanation:
Energy of photon, \({\dfrac{h c}{\lambda}}\) Energy left \({E=0.25 \quad E=\dfrac{h c}{4 \lambda}}\) \({\%}\) change in wavelength \({=\dfrac{4 \lambda-\lambda}{\lambda} \times 100 \%}\) \({=300 \%}\)