• # question_answer A photon in motion has a mass                A) $c/h\nu$ B) $h/\nu$ C) $h\nu$ D) $h\nu /{{c}^{2}}$

[d] $E=h\nu =m{{c}^{2}}\,\Rightarrow \,\,m=\frac{h\nu }{{{c}^{2}}}$