A radiation of energy $E$ falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (1) $E / c$ (2) $2 \mathrm { E } / \mathrm { c }$ (3) $Ec$ (4) $E / c ^ { 2 }$
A radiation of energy $E$ falls normally on a perfectly reflecting surface. The momentum transferred to the surface is\\
(1) $E / c$\\
(2) $2 \mathrm { E } / \mathrm { c }$\\
(3) $Ec$\\
(4) $E / c ^ { 2 }$