Wavelength of photon is equal to the wavelength of electron moving with kinetic energy 1.5eV. What is the value of energy of photon

Dear Student ,
Here in this case use the formula  ,
E=hcλ ,where h=planck's constant , c= speed of light and λ=wavelength of incident photon .
Now put the data and you will able to get the result .
Regards

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