Respuesta :

[tex]\\ \sf\longmapsto c=\lambda v[/tex]

[tex]\\ \sf\longmapsto v=\dfrac{c}{\lambda}[/tex]

Now

[tex]\\ \sf\longmapsto E=hv[/tex]

Put value of v found before

[tex]\\ \sf\longmapsto E=\dfrac{hc}{\lambda}[/tex]